Neurulation begins at week ___ of embryo development.

Answers

Answer 1

Neurulation begins at week 3 of embryo development.

What is embryo development?

Embryo development is a process that involves the growth and differentiation of cells that occur from the fertilization of the egg cell by sperm. During this process, cells divide and differentiate, leading to the formation of various tissues and organs. The three primary stages of embryo development include cleavage, gastrulation, and organogenesis. The process of Neurulation is the third stage of embryo development.

What is neurulation?

Neurulation is a complex process that occurs during embryonic development and is responsible for the formation of the neural tube. The process begins during week 3 of embryo development and is complete by the end of week 4. Neurulation is a crucial stage in embryonic development because it leads to the formation of the central nervous system.

What is the importance of neurulation?

The process of neurulation is essential for the formation of the nervous system in the developing embryo. It is responsible for the formation of the neural tube, which later develops into the brain and spinal cord. Any defects in the process of neurulation can lead to severe developmental abnormalities such as neural tube defects, spina bifida, and anencephaly. In summary, the process of neurulation is a critical stage in embryonic development that leads to the formation of the central nervous system.

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Related Questions

Honeybees provide one of the most important ecosystem services: pollination - and they do this for free! We are experiencing huge losses in pollinator populations throughout the United States and the

Answers

Colony Collapse Disorder (CCD) is a phenomenon characterized by the sudden disappearance of worker bees from beehives, leaving the queen and a few immature bees behind.

The causes of the collapse

The causes of CCD are not fully understood, but prevailing hypotheses include pesticide exposure, parasites and diseases, poor nutrition, and various stress factors. These factors likely interact and contribute to the decline of honeybee populations.

Understanding CCD is crucial for implementing effective strategies to mitigate its impact, including promoting sustainable agricultural practices, reducing pesticide use, improving beekeeping management, and enhancing habitat and forage availability.

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Honeybees provide one of the most important ecosystem services: pollination - and they do this for free! We are experiencing huge losses in pollinator populations throughout the United States and the rest of the world. The decline is so great that many farmers now must import European honeybees to pollinate crops. In 2006, an emerging issue called Colony Collapse Disorder (CCD) caused massive declines in beehives. These declines are still a problem today. Respond to the following prompts in your initial post this week: 1. What is Colony Collapse Disorder and what are the prevailing hypotheses for what causes CCD?

39. If a person's antigen-antibody response stimulates a massive secretion of histamine, the result would cause a severe reaction called
a. active immunity.
b. artificial immunity.
c. passive immunity.

Answers

If a person's antigen-antibody response stimulates a massive secretion of histamine, the severe reaction is called an allergic reaction.

The release of histamine in response to an antigen-antibody interaction is a characteristic feature of an allergic reaction. When the immune system recognizes an allergen (a substance that triggers an allergic response), it produces specific antibodies called immunoglobulin E (IgE). These antibodies bind to mast cells and basophils, which are immune cells that contain histamine.Upon subsequent exposure to the same allergen, the allergen binds to the IgE antibodies on mast cells and basophils, triggering the histamine release. Histamine causes blood vessels to dilate, smooth muscles to contract, and increased mucus production, leading to symptoms such as itching, swelling, hives, difficulty breathing, and in severe cases, anaphylaxis. Active immunity refers to the immune response produced by the person's immune system after exposure to an antigen. Artificial immunity involves the administration of vaccines or immunizations to stimulate an immune response. Passive immunity occurs when pre-formed antibodies are transferred from one individual to another (e.g., through breast milk or injection of immunoglobulins).

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Why is it important for cells of multicellular organisms to undergo mitosis? A) mitosis allows for reproduction B)mitosis increases variation within an organism. C) mitosis produces cells that are different from the original dividing cell. D)mitosis produces cells that are identical to the original diving cell

Answers

The answer is A mitosis allows for reproduction. This is because during mitosis two identical daughter cells are created which can contribute to an embryo.

Hope this helps ! <3

It is important for cells of multicellular organisms to undergo mitosis because mitosis produces cells that are identical to the original dividing cell. Thus, the right option would be D.

Mitosis involves the division of vegetative cells and it results in daughter cells with the same morphology and genome as the parent cell.

The division of vegetative cells in multicellular organisms will ensure that damaged or dead cells are replaced with cells of similar morphology and genome.

Apart from replacing dead or damaged cells, mitosis also allows multicellular to grow in size by allowing similar cells to spring from existing cells.

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(b) Explain why the pulse and breathing rates of both students increased during exercise.​

Answers

Answer:

Because a victim is changing a respiration form from Aerobic to anaerobic forms.

PLS HELP I WILL GIVE BRAINLIEST!!!!

In this activity, you will develop two models for growing new trees that make either red or yellow apples. The two models should compare sexual reproduction and asexual reproduction (grafting). Include the genotypes of the parents and the offspring in your models.

To model sexual reproduction, use Punnett squares to show the results of crosses between trees with different colors of apples. Start by showing a cross between one red parent that has the genotype CC and one yellow parent that has the genotype cc.

Then choose two trees from the first generation of offspring to make a second generation. Cross each of them with another tree that has the genotype Cc.

To model asexual reproduction, use a branching diagram (concept map or tree diagram) to show the results of grafting. Start with a parent that has the genotype Cc. Show four offspring for the first generation of grafting. Then choose two of these offspring as parents for a second generation of grafted trees.

Finally, write two short paragraphs: one under the Punnett squares and another under the branching diagram. Each paragraph should summarize what the diagram shows about genetic variation.

Answers

CC x cc

(red parent) (yellow parent)

Cc x Cc

(offspring from first generation)

C_ x c_

(choose two offspring from first gen)

C_ x Cc

(cross each with Cc parent)

The Punnett square diagram shows genetic segregation and recombination in sexual reproduction of trees with different apple colors. By crossing red and yellow parent trees, a diverse array of offspring with different apple colors (red, yellow, pink) can be produced. The offspring have different combinations of the C and c alleles that determine apple color. Some offspring will receive only C alleles (red), only c alleles (yellow), or both (pink). Further crosses with new parental trees will provide even more variation.

Ever-increasing genetic diversity can be achieved through multiple generations of sexual reproduction.

Cc (parent)

|

Cc (offspring)

|

Cc (offspring)

|

Cc (offspring)

Cc (parent) Cc (offspring)

| |

Cc (offspring) Cc (offspring)

Through asexual reproduction via grafting, the branching diagram shows how the same genetic material (Cc) is propagated. The offspring are genetically identical clones of the parent tree. No new combinations of alleles or genetic diversity are produced. The trees will continue to produce apples of the same color (in this case, red and yellow) as the original parent. Asexual reproduction maintains the existing genotype across generations.

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Punnett squares demonstrates that se.x.ual reproduction can produce genetic variation in the offspring, leading to new combinations of traits.

Branching diagram shows that asexual reproduction can produce trees with consistent traits, but lacks genetic variation as only one genotype is being passed down through generations.

What constitutes the models?

Modeling sexual reproduction using Punnett squares shows that the offspring inherit one allele from each parent. When a red parent with the genotype CC is crossed with a yellow parent with the genotype cc, all the first-generation offspring will have the genotype Cc and have red apple fruit.

\(read\) \(it\) \(all\)!

When these first-generation offspring are crossed with another tree that has the genotype Cc, the second-generation offspring will have the genotype CC, Cc, or cc and either have red or yellow apple fruit.

This model demonstrates that sexual reproduction can produce genetic variation in the offspring, leading to new combinations of traits.

Modeling asexual reproduction using a branching diagram shows that the offspring are genetically identical to the parent tree, as the same genotype is maintained through grafting. Starting with a parent tree that has the genotype Cc and grafting it to four other trees results in four identical offspring that also have the genotype Cc.

When two of these offspring are chosen as parents for a second generation of grafted trees, the resulting offspring will also be genetically identical to the parent trees.

This model shows that asexual reproduction can produce trees with consistent traits, but lacks genetic variation as only one genotype is being passed down through generations.

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As the season changes from fall to winter, you can observe many warm-blooded animals increasing in body size. This increase in body fat is preparing animals for —

Question 7 options:

migration, where large animals tend to survive better.


reproduction, where large bodies attract more mates.


raising infants, where a large amount of energy is needed.


hibernation, where the body fat provides a food source.

Answers

Answer:

hibernation

Explanation:

took test on k12

A. Glucose is a common sugar in the bloodstream of humans. The chemical formula for glucose is C6H12O6. Explain how parts of a glucose molecule are used to make amino acids.

Answers

Glucose is a monosaccharide containing an aldehyde group (-CHO). It is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.

Glucose does not contain nitrogen like amino acid , so unless any chemical is involved glucose cant be converted to amino acid .

It is also known as dextrose. It is referred to as aldohexose as it contains 6 carbon atoms and an aldehyde group. This is the most abundant organic compound.   Glucose is also known as reducing sugar because it belongs to the category open-chain molecule with an aldehyde group.  Glucose is an important component of human blood normally ranges from 65 mg to 110 mg of glucose per 100 mL.

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GMO industry leads to fewer food crop varieties GMOs provide food diversity for insects GMOs industry only operates in the United States GMO agriculture does not cause plant tolerance to herbicides Question 20 GMO plants e.g. corn affected Monarch butterflies by Causing them to mutate Reducing their habitat Making them have to adopt new foods Affecting their navigation in winter months Question 21 Why did Monsanto sue a Canadian farmer? His land was contaminated by Monsanto's GMO plants, he saved and planted the seeds from those plants He failed to plant the seeds Monsanto supplied to him He failed to sell back his seeds to Monsanto, which was an infringement He failed to grow his patented seeds with the companion chemicals

Answers

1. GMO plants, like corn, reduce Monarch butterfly habitat by eliminating milkweed, their primary food source, leading to a decline in their population.

2. Monsanto sued a Canadian farmer, Percy Schmeiser, for growing Monsanto's patented GMO seeds without authorization, alleging patent infringement and unauthorized use of their seeds.

1. GMO plants, such as corn, have been implicated in affecting Monarch butterflies primarily by reducing their habitat. This reduction in habitat is primarily due to the loss of milkweed, which is the primary food source for Monarch caterpillars. Some GMO crops, such as herbicide-tolerant crops, allow for the increased use of herbicides, which can eliminate milkweed and other flowering plants from agricultural fields.

2. Monsanto sued a Canadian farmer, Percy Schmeiser, because his land was contaminated by Monsanto's GMO plants, and he saved and planted the seeds from those plants without a license or permission from Monsanto. According to Monsanto, this constituted patent infringement as the farmer was growing Monsanto's patented seeds without authorization.

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The complete question is:

1. GMO industry leads to fewer food crop varieties GMOs provide food diversity for insects GMOs industry only operates in the United States GMO agriculture does not cause plant tolerance to herbicides GMO plants e.g. corn affect Monarch butterflies by Causing them to mutate Reducing their habitat Making them have to adopt new foods Affecting their navigation in winter months.

2. Why did Monsanto sue a Canadian farmer? His land was contaminated by Monsanto's GMO plants, he saved and planted the seeds from those plants He failed to plant the seeds Monsanto supplied to him He failed to sell back his seeds to Monsanto, which was an infringement He failed to grow his patented seeds with the companion chemicals.

you are an aspiring botanist and decide to study some orchid genetics. knowing that the pink color phenotype is an incompletely dominant phenotype of purple and white alleles, you decide to study it further. you discover that when you cross two pink orchids, you only ever obtain a phenotypic ratio of 1/3 purple orchids to 2/3 pink orchids. how might you explain this phenomenon? group of answer choices the white color allele produces a lethal phenotype when two copies are present. the purple color allele produces a lethal phenotype when two copies are present. the white color allele produces a lethal phenotype when one copy is present. the purple color allele produces a lethal phenotype when one copy is present.

Answers

This phenomenon can be explained by the fact that the pink color in orchids is the result of a heterozygous genotype, where the dominant allele produces pink pigment and the recessive allele produces no pigment.

And when two heterozygous orchids are crossed, the offspring have a 25% chance of inheriting two recessive alleles, resulting in a white phenotype.

Orchid color inheritance is a case of incomplete dominance, where neither of the alleles is fully dominant over the other. In this case, the pink color is the result of a heterozygous genotype, where the dominant allele produces pink pigment and the recessive allele produces no pigment. When two heterozygous orchids are crossed, there is a 25% chance of the offspring inheriting two recessive alleles, resulting in a white phenotype.

The remaining 75% of the offspring will inherit at least one dominant allele and produce pink pigment, resulting in the observed 2/3 pink to 1/3 white phenotypic ratio.

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what are simple one-celled organisms and the most plentiful pathogens

Answers

Bacteria are simple one-celled organisms and the most plentiful pathogens.

Bacteria are unicellular microbes that exist in practically all of the Earth's environments. They may multiply quickly, and some strains can infect people and other animals with sickness.

Bacterial infections can range in severity from minor, like a skin or ear infection, to serious, like pneumonia or sepsis. Bacteria can be spread by ingesting contaminated food or water, coming into touch with contaminated surfaces, or coming into contact with infected people.

The best method to avoid bacterial diseases is to practice excellent hygiene, which includes handwashing, handling and preparing food correctly, and vaccination. When an infection does happen, it may be treated with antibiotics.

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Why does mitosis/asexual reproduction occur in all organisms?

Answers

Answer: Asexual reproduction is the duplication of the genetic material from a parent organism to create a new organism. in mitosis also the cell first makes the division of cytoplasm takes place and thus the parent cell divided itself into 2 daughter cells which are like each other.

(You can find all this on google)

Hope this helps!

Explanation:

What is difference between acid and bases?

Definition. A substance, mostly liquid that donates a proton or accepts an electron pair in reactions. An acid increases the concentration of H+ ions. A base is a substance that releases hydroxide (OH-) ions in aqueous solution, donates electrons and accepts protons.
(just if someone needs this i guess)

Answers

Answer:

Acids are sour, gives burning sensation, generally sticky, reacts with metals to produce hydrogen gas. Although bases are opposite as they are bitter, generally odorless (except ammonia), they are slippery; bases react with fats and oils. In phenolphthalein, indicator acids remain colorless, and base gives pink color.

Explanation:

An acid is a substance that releases hydrogen ions into an aqueous solution. A base is a substance that releases hydroxide ions.

Acids are sour, gives burning sensation, generally sticky, reacts with metals to produce hydrogen gas. Although bases are opposite as they are bitter, generally odorless (except ammonia), they are slippery; bases react with fats and oils. In phenolphthalein, indicator acids remain colorless, and base gives pink color.

Questions why is the heating in the Benedict's is test and millon test carried out in a water bath​

Answers

The heating in the Benedict's test and Millon test is carried out in a water bath to maintain a constant and controlled temperature. This ensures accurate and reliable results by minimizing external factors that could influence the reactions taking place.

The Benedict's test and Millon test are both chemical tests used to detect the presence of reducing sugars, such as glucose, in a given solution. These tests involve a reaction between the reducing sugar and a reagent, which undergoes a color change in the presence of the sugar.

Heating is an essential step in both tests because it helps to facilitate the reaction between the reducing sugar and the reagent. By applying heat, the rate of reaction increases, allowing for faster and more reliable results. However, it is crucial to maintain a consistent and controlled temperature throughout the reaction to ensure accuracy.

A water bath is used for this purpose. A water bath consists of a container filled with water that is heated to a specific temperature, typically around 70-100 degrees Celsius, depending on the test being performed. Placing the test tubes containing the reaction mixture into the water bath allows the solution to be heated uniformly and consistently.

The water bath provides a stable and controlled environment, preventing sudden temperature fluctuations that could affect the reaction rate and, consequently, the test results. It helps to maintain the reaction at the desired temperature for a specified duration, ensuring optimal conditions for the reaction to occur.

By carrying out the Benedict's test and Millon test in a water bath, scientists and laboratory technicians can achieve reliable and reproducible results, allowing for accurate identification of the presence of reducing sugars in a given solution.

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Which is the most important product of cellular respiration?
(A) ATP
BADP
C) NADH
D FADH₂

Answers

Answer:

A:

ATP

Explanation:

Science yeah

nail-patella syndrome is a rare autosomal dominant disease that causes defects in human nails. the gene n is found on chromosome 9, and is located 10 map units from the gene i that determines the abo blood type. helen has nail-patella syndrome and type ab blood. her father has type b blood and does not have nail-patella syndrome. which of the following shows the genotype of a gamete that helen can produce, paired with its correct description?

Answers

The genotype of the gamete that Helen can produce can be either NIA or can be NIB.

Nail-patella syndrome is basically a rare autosomal dominant disease, so Helen must have at least one dominant allele, which is represented as N for the syndrome. Helen has type AB blood, which is a result of having both A and B alleles, which are represented as IA and IB, for the ABO blood type. This indicates that Helen is heterozygous for the ABO gene.

The gametes can be NIA, this gamete carries the dominant allele for nail-patella syndrome and the A allele for the ABO blood type and NIB, this gamete carries the dominant allele for nail-patella syndrome and the B allele for the ABO blood type.

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According to the theory of natural selection, some individuals in a population survive while others die.he proposed that survival is due to the

A. Possession of structures developed through use
B. Possession of adaptions suites to the environment
C. Lack of competition within the species
D. Ability to change their genes

Answers

The correct answer is A.
A is the right answer!!!!!!

If you can pls help with this questionnnn.....if the cilia of a paramecium were destroyed, the most direct effect would be on the ability of the paramecium to
A. Release energy
B.priduce offspring
C.obtain food
D. Excrete solid wastes

If you can pls help with this questionnnn.....if the cilia of a paramecium were destroyed, the most direct

Answers

Answer:

C.obtain food

Explanation:

If the cilia of a paramecium were destroyed, the most direct effect would on the ability of the paramecium to obtain food.

The cilia is used by paramecium to sweep food into its mouth.

Without the cilia in this organism, the ability to obtain food would be totally and completely lost.

After the food falls into the oral groove of the paramecium, the cilia sweeps in the water and the food inside.

This food is passed from the oral groove into the gullet.

Pioneer species are the last species to develop in a community. True False

Answers

Answer:

i think it's false

This is false, it’s not true

(d) Other than the shape and presence of haemoglobin, state one more adaptation of a normal red blood cell. Explain how the adaptation helps the red blood cell to perform its function. ( d ) Other than the shape and presence of haemoglobin , state one more adaptation of a normal red blood cell . Explain how the adaptation helps the red blood cell to perform its function .​

Answers

The adaptations of the red blood cells for this function include:

have thin membranes which enables easy diffusionsmall and flexible structure enabling them to travel through capillaries.

What are some adaptations of red blood cells help it transport oxygen in oxygen and carbon dioxide transfer?

Red blood cells are primarily responsible for delivering oxygen to cells and tissues as well as the removal pf carbon dioxide as waste from the tissues and cells.

The adaptations of the red blood cells for this function include:

possess thin membranes which enables easy diffusionthey are small and flexible enabling them to travel through capillaries.

Therefore, red blood cells possess adaptation which enables them to transport gases efficiently to and from the tissues.

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Which mental function has the characteristics of preferring a planned and orderly way of life, likely to be in control as much as possible, and planning work ahead of time to avoid rushing before a deadline? Malaise, Judging, Introversion, Feeling

Answers

The mental function that has the characteristics listed above is Judging Mental Function.

Personality types and functions

Personality is defined as the individual way of thinking, feeling and behaving. This means that individuals have a unique way or pattern of behaviour.

Some typical examples of personality are the judging and introversion personality. According to Myers-Briggs' personalities the characteristics of judging personality are:

They prefer a planned and orderly way of life,

They are usually in control as much as possible, and

The plan their works ahead of time to avoid rushing before a deadline.

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Answer:   judging

Explanation:

what happens to the muscles of people with marfan syndrome

Answers

Answer:

Muscle fatigue is often reported by patients with Marfan syndrome although myopathy is not classically considered a component of Marfan syndrome [1, 2, 4, 6, 7]. In addition to apparent muscle underdevelopment, some patients report myalgia or cramps suggesting skeletal muscle involvement.

What does CGG represent?

Answers

Answer:

Shorthand for the DNA sequence: cytosine-guanine-guanine. Cytosine and guanine are two of the four molecules, otherwise called nucleic acids, that make up DNA.

Explanation:

<3

which term describes the tissue layer directly below the epidermis?

Answers

The tissue layer directly below the epidermis is called the dermis.

The dermis is the second layer of the skin and is responsible for providing structural support and nourishment to the epidermis. It consists of connective tissue, blood vessels, nerves, hair follicles, and sweat glands.

The dermis plays a crucial role in maintaining the integrity and functionality of the skin. It provides elasticity, strength, and flexibility to the skin, and contains numerous sensory receptors that allow for the perception of touch, pressure, and temperature.

Additionally, the dermis is involved in regulating body temperature and participating in immune responses.

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PLZ GUYS I DONT KNOW WHAT TO WRITE ,I NEED UR HELP

I need a 2 complex questions about human overpopulation

Answers

Answer:

1.) Is over population a problem only in areas where population density is high?

2.) why are developing countries experiencing rapid population growth while developed countries are growing more slowly or not at all?

Answer:

Is overpopulation a problem only in areas where population density is high?

What is the connection between population growth and climate change?

Jenna's age Jessica's age

today x x + 5


in 5 years x+5

5 years ago x + 5 - 5


Equality x + 5 = x + 5 - 5

=> x + 5 = x


The equation is x + 5 = x


That equation has not any solution, because it reduces to 5 = 0, which is an absurd.


So, the conclusion is that information given by Jenna is wrong.


It is logical: if the difference of the ages is 5, in five years Jenna will have 10 years more than what her sister had 5 years ago, no 5 as she told Jessica.

Answers

Answer:

Here ya go

Explanation:

Water is a molecule with slightly positive hydrogen atoms and a slightly negative oxygen atom.
This unique arrangement gives water its -
A
B
с
D
conductivity properties
electrolytic properties
nonpolarity
polarity

Answers

The unique arrangement of water gives it polarity, which is responsible for its electrolytic and conductivity properties.


Water is a polar molecule with slightly positive hydrogen atoms and a slightly negative oxygen atom.

This unique arrangement gives water its polarity, which allows it to form hydrogen bonds with other polar molecules.

The polarity of water is responsible for its electrolytic properties, which means it can conduct electricity.

Additionally, the polar nature of water allows it to dissolve many substances, making it an important solvent.

Water also has high surface tension and adhesion due to its polarity, which helps it stick to surfaces and allows capillary action.

Overall, the unique arrangement of water molecules gives it many important properties that are essential for life.

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A pea plant exhibits a recessive trait. Which statement is most likely true about the plant?
• The plant is identical to its parent plant.
• The plant has different alleles for the gene that codes for the trait.
• The plant has two identical alleles for the gene that codes for the trait.
The plant does not have the same genes for the trait as its parent plant.

Answers

The statement "The plant has two identical alleles for the gene that codes for the trait" is most likely true about the plant.

What is a recessive trait?

A recessive trait is a characteristic or phenotype that is only expressed when an individual has two copies of a recessive allele, one inherited from each parent.

Recessive traits are masked by dominant traits in individuals who have one dominant allele and one recessive allele for the same gene. However, if an individual has two recessive alleles, they will express the recessive trait. Examples of recessive traits include blue eyes, red hair, and sickle cell anemia.

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How are igneous rocks classified?

A. by cooling rate

B. by size

C. by weight

D. by texture and composition

Answers

D. Texture and Composition

Why the bass and crayfish benefit from an increased level of phosphate, initially, but then die off

Answers

Answer:

Increased levels of phosphate are beneficial to phytoplankton and aquatic plants. In the short-run, this means increased micronutrients for herbivorous and omnivorous fish.

The phosphate, however, reacts with the water to reduce the oxygen levels obtainable in the water. Without oxygen, the fishes die off.

It is not unusual to find that with increased phosphate in water, healthy fishes begin to die off without any other plausible explanation.

The solution is to clean the water or treat it with solutions that impact positively whilst reducing the phosphate levels.

Cheers!

1. Write the complementary code for the following DNA transcription.
A T G C A T T G

Answers

Answer:

T A C G T A A C

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