Agood model of the cell membrane would be
a. a chain link fence.
b. a film of food wrap.
c. a wall of stones and mortar.
d. a river with objects floating in it.

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.