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Gala2k [10]
3 years ago
7

It does not seem particularly surprising to us that we might find gill pouches, tails, or other such structures in humans. But w

e would be very surprised if we found hair, nipples or middle ear bones in fish, amphibians or reptiles. Why?
Biology
1 answer:
Pavel [41]3 years ago
5 0

Answer:

In the course of evolution mammals are the animals which are evolved recently as compared to other groups such as fish, amphibians, or reptiles.

In addition, fur or hairs on body, mammary glands, middle ear bone, warm-blood, et cetera are the characteristics of mammals.

These characteristics were evolved during the course of evolution; they were not present in ancestral organisms.

However, tail, gill pouches, et cetera are characteristics of our ancestral groups. Thus, characters can be sometimes observed in mammals.

But mammals characteristics can not be observed in organisms which were evolved before mammals such as fishes, amphibians, reptiles, et cetera.

You might be interested in
Which layer does temperature zone does most precipitation occur?
siniylev [52]

Answer:

troposphere

Explanation:

The troposphere is the temperature zone of the atmosphere where most precipitation occurs. It has a normal temperature of 0 degrees Celsius. This layer is where the majority of weather events take place. It is 10–15 kilometers thick above the Earth's surface.

5 0
3 years ago
Please answer quick!! Given the following template strand, write in the sequence of the complementary DNA
yarga [219]

Answer:

ATG CTT CAG GGA ATC

Explanation:

Using Chargaff's rule:

A=T

G=C

You can find the DNA complentary strand

5 0
2 years ago
In animals, the inability to make the pigment melanin results in albinism, a recessive autosomal condition. Two unaffected paren
Fittoniya [83]

Answer: 1/16, or approximately 6.25% (see explanation below)

Explanation:

Answering this question requires two steps.

First, we need to figure out the probability that this couple will have a child with albinism in the first place. We know the following:

- Both parents are unaffected.

- The couple has already had one affected child.

- Albinism follows an autosomal recessive inheritance pattern.

Let ( M = normal gene ) and ( m = mutated gene ). Since the condition is recessive, the affected child can be assumed to have a “mm” genotype. Barring the possibility of a de novo mutation (which are assumed to be rare), the affected child must have inherited one ”m” allele from each parent. Since both of them are unaffected, however, we can assume that they are both carriers (genotype “Mm”). In conclusion, 1/4 of their offspring (25%) <em>for any given pregnancy</em> may be expected to have albinism. See the resulting Punnett square:

<u>       |      M    |      m   </u>

<u>M    |    MM   |    Mm  </u>

<u>m    |    Mm   |    mm  </u>

Note that the question asks about the probability that not one but two consecutive births result in affected children. Since it can be assumed that both events are independent (meaning: the outcome of a pregnancy does not influence the outcome of following ones), we may apply the rule of multiplication for probabilities. The final answer is therefore 1/4 * 1/4 = 1/16.

7 0
3 years ago
Explain the biological structure hierarchy of the human body and the role of homeostasis in maintaining the body. Include the fo
Nuetrik [128]

Answer:

1. Biological structure of the human body

The human body is organized in different levels according to their complexity.

The levels are the folowing (increasing complexity).

1. Atom (N, O, C,..)

2. Molecule (Protein, lipids, water...)

3. Organelle (mitochondria, golgi apparatus,...)

4. Cell (blood cells, bone cell,..)

5. Tissue (connective tissue, epithelial tissue,..)

6. Organ (lungs, kidney,..)

7. Organ system (skeletal system, muscuar system,...)

8. Organism (the human body)

Each of the levels is formed by an agrupation of the previous level. For example, cells are formed by a number of organelles, and a group of cells form a tissue.

Cells are the basic units of structure of the body, and there are different types of them.

2. Homeostasis

Homeostasis is a process of the body by which the organism works to maintain a stable internal environment, while adjusting to changes in the external environment.

This process is possible because of the work of both the nervous system and the endocrine system. While the first controles the body's activities and detects the necesity of adjustments, the second regulates the activities by using hormones.

6 0
1 year ago
The German physician Rudolf Virchow used a microscope
MA_775_DIABLO [31]

Answer:

D

Explanation:

Virchow's work is based off of that living things cannot exist without there being previous living things. Therefore, it has to be D because all new cells must come from currently living cells

8 0
3 years ago
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