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mestny [16]
3 years ago
5

How does a comparison of the embryos provide evidence of evolution

Biology
1 answer:
klio [65]3 years ago
8 0

Answer AND Explanation:

Embryos of different vertebrate groups are morphologically similar during the early stages of development. Such similarity suggests a common ancestry. The closer the resemblance between the early stages of different organisms, the closer their evolutionary relationship.

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3. The cerebellum of the human is divided into two portions, while the sheep only has one portion of the cerebellum. Why is ther
pentagon [3]

Answer:

The human brain is divided in to two parts and that is why human brain is responsible for controlling behavior of human and motor control . The sheep have only one portion. Compared to the sheep, the human olfactory bulb is larger in size while the stem on the sheep is larger than human. The cerebellum in the human brain is larger and more secure than the sheep.

4 0
3 years ago
Read 2 more answers
Meiosis reduces chromosome number and rearranges genetic information. Explain how the reduction and rearrangement are accomplish
Alisiya [41]

Answer:

Explanation:

Meiosis is a form of cell division that occurs in the sex cells of organisms. It ensures the reduction of a diploid cell to an haploid cell to allow for the formation of a diploid zygote after fertilization (contribution of both parents haploid sex cells to give a diploid zygote). Thus, this process is very essential and important.

The reduction is accomplished by 2 divisions after the duplication of chromosomes

- first division: separation of homologous pairs of chromosomes (this reduces the total in half)

- second division: separation of sister chromatids of a chromosome.

The rearrangement in meiosis occurs by crossing over/genetic recombination.

This is the exchange of genetic material between homologous pairs of chromosome bringing about a rearrangement and genetic variation

An example of a chromosomal abnormality that arises as a result of defects in this process is the Down Syndrome which is caused by a nondisjunction of the chromosomes 21 pair in a sex cell.

This condition produces offsprings that have some characteristic facial features, short stature etc

6 0
3 years ago
Which is associated with weak light rays that travel in different directions?
Ivenika [448]

Answer:

"scattering" that would be the correct answer :)

Explanation:

hope it helps

8 0
3 years ago
How does the bear as an omnivore affect the ecosystem?
cestrela7 [59]
The bear affects the ecosystem by eating plants and animals which lowers invasive species levels.
3 0
3 years ago
A research team finds that an experimental drug causes problems for prenatal development, but only if it is given within the fir
Phoenix [80]

Answer:

a. heart development.

Explanation:

As the third week of fetal development starts, the process of formation of blood vessels begins. Also, the splanchnic mesoderm in the head end of the embryo forms heart on days 18 and 19. Since it develops heart, this part of the mesodermal cells is called the cardiogenic area. The underlying endoderm sends the induction signals to these mesodermal cells to form a pair of endocardial tubes that gradually develop into a single primitive heart tube.

This primitive heart begins to beat by the end of the third week of development. Therefore, any drug that affects fetal development during the first 20 days of the pregnancy might affect the development of the heart.

4 0
3 years ago
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