What is the conservation of genes?

Nh3 +02-no + h20 is unbalanced what is the balanced equation

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.

2points what do bacteria have in common with the cells of other living organisms?