Which is part of the theory of evolution by natural selection? O A. All animals in a population are able to reproduce.
O B. Adaptations cannot be passed along to later generations.
O C. Small changes add up over many generations.
O D. Animals have no variation among themselves.

O C. Small changes add up over many generations.

Explanation:

Evolution by natural selection states that small changes (different allele frequencies) that confer upon an individual a reproductive advantage will eventually cause the population to evolve into something different. The accumulation of all these little changes as alleles become more frequent will eventually cause evolution.

Why not A: Not all animals need to reproduce. This is the opposite of what's true: only some animals live long enough to reproduce and increase the frequency of their alleles in the population.

Why not B: They have to be passed down. Remember, these adaptations are not acquired, like Lamarck thought, but rather inherent in genetics, as Darwin thought.

Why not D: This is just plain wrong.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands