What process best explains how a nerve cell and a muscle cell can both develop from the same fertilized egg

As a small change in a person's dna can cause a genetic disorder

What best explains the inability for life to exist in earth early atmosphere

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.