Which is part of the theory of evolution by natural selection? A. Adaptations cannot be passed along to the next generation.
B. Evolution can only cause small changes to a species.
C. Only the best-adapted animals in a population survive.
D. Animals that survive cannot pass along their adaptations.

Only the best-adapted animals in a population survive.

Explanation:

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

well the answer is 2!