The study of the connection of the roles of different animal systems is called

Explain the side effects of cancer treatments

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?