From diffusion of nutrients from underlying layers
I think the answer will be C
The answer will be climate !
A cytotoxic T cell recognizes and destroys cells infected by a virus. They are also responsible for killing cancer cells too.
Answer:
The correct answer is option A. "Advantageous alleles do not arise on demand".
Explanation:
One of the most common misconceptions of how evolution occurs is that an organism is able to develop advantageous traits on demand. Believing that, for instance, a giraffe was able to develop a large neck because it wanted to reach large trees. This is wrong, evolution is the product of nature selecting random mutations that are advantageous to a species.