Answer:
I think the answer is b. DNA
This is because all land vertebrates share a common ancestor. All land vertebrates emanated from evolution form the oceans and seas from a group categorized as Sacropterygii. Therefore during the early phylotypic stages of embryonic development, the embryos of all land vertebrates look alike morphologically. It is believed it is during this stage that the basic plan of the body takes shape before it begins to diverge.
Qhat do you mean or is this just a statement
Answer;
D.60 million years
Explanation;
The two species shared a common ancestor 60 million years ago, if the molecules found in these two species differ by a total of six mutations.
Mutation is a sudden, random spontaneous change that occur in the genetic make up of an organism or a cell.
If one mutation occurred after 10 million years;
Then six mutations will need (6 ×10) 60 million years.