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HACTEHA [7]
2 years ago
14

Why fish have smooth scales on their body​

Biology
2 answers:
melomori [17]2 years ago
6 0

Answer: Scales protect fish from parasites as well as predators and reduce friction with the water. Scales also provide a flexible covering for a fish allowing it to move easily while swimming.

Explanation:

Makovka662 [10]2 years ago
5 0

Answer:

Explanation:

Fish have scales for many reasons. Firstly, to protect the skin of the fish from attacks from predators, parasites and other injuries. Secondly, scales overlap each other in the same way that an armour would protect a person. Hence, providing a layer of protection for the fish.

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Which of the following would NOT characterize allopatric selection?
kotykmax [81]
I believe the answer is B.
4 0
3 years ago
Is a beneficial mutation always
Klio2033 [76]

Answer:

B

Explanation:

B is the correct answer because the environment effects how the body has to adapt.

3 0
2 years ago
Which of the following is true about natural selection? ​
Anna007 [38]

The options for this question are:

- Requires genetic variation

- Results in descent with modification

- Involves differential reproductive success

- All of the above

Answer:

<u><em>The correct option is d) All of the above</em></u>

Explanation:

The theory of natural selection explains that genetic variations occur in organisms of a species. Those organisms which are better adapted to live in an environment are able to survive and pass on their characteristics to their offsprings, hence descent with modification. Through this phenomenon, evolution takes place with the passage of time. Natural selection favours survival of the fittest. Hence, all of the above statements are true.

3 0
3 years ago
Why don’t magnets affect gamma rays as they pass over it?
daser333 [38]
We may apply Fleming's Left Hand Rule of Electromagnetism to determine how a charged particle behaves in a magnetic field. However, because the gamma rays do not have a charge on them, like alpha particles and beta particles do, they are not deflected. 
Gamma rays are electromagnetic waves and its is a characteristic of electromagnetic waves that they have no charge.
8 0
3 years ago
The sickle-cell allele produces a serious blood disease in homozygous recessive individuals. why doesn't natural selection elimi
icang [17]

No, the sickle-cell anemia allele won't be eliminated by natural selection.

Sickle-cell anemia trait is controlled by a single gene and the allele (S) for sickle-cell anemia is a harmful autosomal recessive.

It is caused by a mutation in the normal allele (A) for hemoglobin (a protein on red blood cells).

Heterozygotes (AS) with the sickle-cell allele are resistant to malaria, a deadly tropical disease. It is common in many African populations.

In these areas, (S) carriers have been naturally selected, because their red blood cells, containing some abnormal hemoglobin, tend to be in sickle shape when they are infected by the malarial parasite.

Therefore, they are more likely to survive and reproduce. This keeps the S allele in the gene pool.

Learn more about Sickle-cell anemia on

brainly.com/question/14505007

#SPJ4

3 0
1 year ago
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