Hox genes have been found in all complex animals, from the velvet worm that dates back some 600 million years, to the modern human. And in all that time, the letters of their D.N.A. have remained virtually (answer).

Answer: Hope this helps!

Explanation:

Answer:

Yes, bacteria do have a cell wall.

Explanation:

The bacterial cell wall has a complex structure that is required for cell shape in most bacteria which acts as protective barrier which prevents it from becoming rigid, example: Gram positive bacteria

Some might not also have a cell wall for example: Mycoplasma

Answer:

Yes it does have

The bacterial cell wall is a complex, mesh-like structure that in most bacteria is essential for maintenance of cell shape and structural integrity.

Explanation:

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Answer:

mILKY wAY gALAXY

Explanation:

The large region with distinct cultivation, plantation, climate, soil and wildlife is called a biome. They include desert, tundra, grasslands, savanna, rain-forest etc.

Taiga biome is prominent in North America.

Therefore, option A is correct.

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Answer: A, Taiga

Explanation:

Answer:

just watch the video it gives you tge anwers

1. mRNA attaches to the ribosome.

2. tRNA's attach to free amino acids in the cytoplasmic "pool" of amino acids.

3. tRNA carries its specific amino acid to the ribosome.

4. tRNA "delivers" its amino acid based on complementary pairing of a triplet code (anticodon) with the triplet code (codon) of the mRNA.

5. Enzyme "hooks" the amino acid to the last one in the chain forming a peptide bond.

6. Protein chain continues to grow as each tRNA brings in its amino acid and adds it to the chain.

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Answer:

shorter and higher

Explanation:

UV  is further along in the EM spectrum so has a higher frequency and shorter wavelengths than visible light.

Of the three phyla in the deuterostomes recognized by biologists, Chordata phylum includes animals with backbones.

Any animal that belongs to the phylum Chordata, which also contains the most highly developed creatures, the vertebrates (subphylum Vertebrata), as well as the tunicates (subphylum Tunicata) and cephalochordates, is referred to as a chordate (subphylum Cephalochordata). Several classifications pair the chordates with the phylum Hemichordata.

As the name suggests, a chordate has a strong, dorsal supporting rod at some point in its life cycle (the notochord). The gill openings that open from the throat to the external, a tail that extends behind and above the anus, a hollow nerve cord above (or dorsal to), and an endostyle (a mucus-secreting structure) or its derivative between the gill slits are further characteristics of chordates.

(A distinguishing trait could only exist in the developing embryo and vanish when the embryo develops into the adult form.) The nearly allied phylum Hemichordata has a relatively similar body arrangement.

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Answer: Probably B?

Explanation:

The possible examples below would most likely lead to a change in the cell theory: Scientists discover life on Mars that is not made of cells, i.e., option A, despite the fact that the cell theory states that all living organisms are made of cells.

Cell theory explains that life is made up of cells, but If scientists were to discover life on Mars that did not fit this definition, it would challenge the current understanding of the cell theory and the discovery of life on Mars that is not composed of cells would indicate that the cell theory is not universally applicable.

Hence, the possible examples below would most likely lead to a change in the cell theory: Scientists discover life on Mars that is not made of cells, i.e., option A, despite the fact that the cell theory states that all living organisms are made of cells.

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Answer:B

Explanation:

A p e x

Stories differ from scientific explanations by the fact that they are based on imagination. Thus, the correct option is B.

A scientific explanation may be defined as a type of explanation that utilizes numerous observations and measurements in order to explain the fact that we see in the natural world on the basis of accurate and valid evidence.

Stories are based on imagination, while scientific explanations are based on evidence. It can not be said that stories are always negative. It may not remarkably true that stories are avoided presenting bias.

Scientific explanations always match with logical comprehension as well as the suggested evidence with respect to the fact in a systematic way.

Therefore, stories are based on imagination is that fact that differs stories from scientific explanations. Thus, the correct option is B.

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Answer:

a

Explanation:

Answer:

The skeletal system

Explanation:

The skeletal system makes up the framework of the body and allows us to move when our muscles contract. It stores minerals (e.g. calcium, phosphorous) and releases them into the body when they are needed. The skeletal system also protects internal organs and produces blood cells. It is this skeletal system responsible for interacting to produce this work of art

Answer:

B. The universe was created from a single massive explosion

Explanation:

That is actually the Big Bang Theory

Answer:

B

Explanation: b is the only answer there that could be considered as a theory

The phenomenon is called gene interaction or gene epistasis. Gene interaction occurs when the expression of one gene is influenced or masked by the presence of another gene.

This can lead to deviations from Mendel's laws, which describe the inheritance patterns of traits controlled by single genes. In cases of gene interaction, the phenotype observed may be different from what would be predicted based on Mendel's laws.

There are different types of gene interactions, such as dominant epistasis, recessive epistasis, and duplicate gene action. These interactions can have significant impacts on the expression of traits in an organism.

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Pigments, are the light-absorbing molecule that plants use to absorb energy, chlorophyll is the light absorbing pigment, hence option B is correct.

Plants get their green color from a pigment called chlorophyll, which also aids in photosynthesis, which is how plants make their own food.

In a plant, chlorophyll's function is to absorb light, often sunlight. Two types of energy storing molecules receive the light energy that is absorbed.

The plant uses its stored energy to turn water and carbon dioxide from the air into glucose, a form of sugar, through photosynthesis.

Therefore, chlorophyll is a pigment, considered as a light absorbing molecule that plants use to absorb energy, hence option B is correct.

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The cell theory is a fundamental scientific theory that states that all living organisms are composed of one or more cells, the cell is the basic unit of life, and all cells come from pre-existing cells through the process of cell division.

The discovery of cells with the aid of the microscope in the 17th century by Robert Hooke, Anton van Leeuwenhoek, and other scientists led to the development of the cell theory. The microscope allowed scientists to observe the structure and function of cells, and to study the diversity of life at a cellular level.

This led to the realization that all living organisms are made up of cells, and that cells are the building blocks of life. The cell theory has been widely accepted and has been the foundation of modern biology, and it is considered one of the most important scientific discoveries in history.

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According to the research, the correct option is A. Decreased blood pressure due to reduced resistance is a long term effect of regular exercise on the cardiovascular system.

Activities such as walking, jogging and swimming are some of the most common physical exercises, which are carried out frequently to preserve or optimize physical condition.

In this sense, it is recommended to strengthen the cardiovascular system with aerobic exercises that improves vascular responses by stimulating vasodilation and blood vessels increase their length and diameter thus lowering blood pressure.

Therefore, we can conclude that according to the research, the correct option is A. Decreased blood pressure due to reduced resistance is a long term effect of regular exercise on the cardiovascular system.

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Answer:

Explanation:

Incomplete dominance occur when two allele expresses itself in the phenotype of an organism.

Its a situation where by an allele is not dominant over another other in an heterozygous condition but it gives a blend of the two allele in the phenotype of the offspring.

Example is the phenotype of a 4'o clock plant that gives pink flower when a red flower is crossed with white flower.

Answer:

as resulted in a decrease in mustard production.

Explanation:

Mustard output has probably decreased as a result of pesticide usage that accidentally kills bees. This is due to the fact that bees are essential for the pollination of mustard plants. The transport of pollen from a plant's male reproductive organs to its female reproductive parts, which enables fertilization and the development of seeds, is known as pollination. Mustard plants require pollination in order to set seed and generate a crop.

The accidental killing of bees by the use of insecticides led to a decrease in mustard production because bees play a crucial role in the pollination of mustard plants, Without pollination, mustard plants will not produce seeds, and will not yield a harvest. Mustard farming is often done in conjunction with beekeeping, so when the bees were killed by the use of insecticides, it is likely that the number of bees available for pollination decreased, leading to fewer mustard plants producing seed. This, in turn, resulted in a decrease in mustard production.

ANSWER:

When any specific species undergoes natural selection, they are essentially slowly adapting to their environment. Giraffes, for example, have very long necks so that they can easily reach the leaves of a tree. In the past, giraffes may not have had long necks, but since their environment has changed since then, they have adapted.

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Answer:

Explanation:

CAUSE

Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.

Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.

EFFECT

Diseases can affect people not only physically, but also mentally, as contracting and living with a disease can alter the affected person's perspective on life. Death due to disease is called death by natural causes.

An epidural increases the chance of having a cesarean section, the correct option is B.

An epidural is a regional anesthesia technique commonly used during labor to provide pain relief to the mother. While it effectively reduces the pain experienced during childbirth, it can also have certain effects and potential risks. One of the most common problems associated with epidurals is an increased likelihood of cesarean section.

When an epidural is administered, it can lead to a decrease in the mother's ability to feel and control her contractions. This can result in a longer labor process and potential complications, such as fetal distress or an inability to progress in labor. The correct option is B.

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The question is inappropriate; the correct question is:

Carlo, in labor with her first child, is in a great deal of pain and has been experiencing strong contractions for nearly 12 hours with little progress toward birth. Although Carla was hoping for a natural birth, her doctor has urged her to use an epidural. Which of the following problems occurs most often following an epidural?

A) Newborns are at high risk for birth complications like cerebral palsy.

B) An epidural increases the chance of having a cesarean section

C) An epidural speeds up the labor process.

D) The mother loses consciousness prior to delivery

In a traditional vaginal hysterectomy, the following steps may be performed laparoscopically:

a. Creation of pneumoperitoneum.

b. Inspection of the abdominal cavity.

c. Removal of adnexa or adhesions.

d. Uterine mobilization.

e. Ligation of uterine arteries.

f. Division of uterosacral and cardinal ligaments.

g. Vaginal cuff closure.

The advantage of the laparoscopic approach in comparison to traditional vaginal hysterectomy is that the laparoscopic approach has lower morbidity rates, reduces pain, and has a shorter hospital stay. Laparoscopic surgery allows faster postoperative recovery. It also minimizes blood loss, prevents the need for abdominal incision, and lowers the risks of complications.

Laparoscopic surgery is a type of surgery in which tiny (less than one centimeter) incisions insert short, narrow tubes (trochars) into the abdomen. Instruments that are long and narrow are inserted through these trochars. These instruments are used by the surgeon to cut, manipulate, and stitch tissue.

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Answer:

Hypertension, obesity

Explanation:

A coronary artery disease, CAD, can be described as a disease that affect the arteries that carries blood from the heart to other parts of the body.

In this case, the disease is known to cause the blockage of the artery which is through the deposition of excess fats in the body.

Answer:

c. atherosclerosis

The frequency of mice that are heterozygote is 0.3492

Hardy-Weinberg equation is given by p² + 2pq + q² = 1 and p + q = 1

where 2pq is the heterozygote frequency.

p² = 120/200

p = 0.7746

p + q = 1

q = 0.2254

Heterozygote frequency = 2pq = 2(0.2254)(0.7746) = 0.3492

The frequency of mice that are heterozygote is 0.3492

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