Molecular clocks use rates of mutation to measure evolutionary time.Mutations add up at a fairly constant rate in the DNA of species that evolved from a common ancestor. The more mutations that happened in each lineage, the greater is the differences between these lineages.
I believe it's D don't take my word for it.
The answer is
B........................................
Antigens determine blood type
The greenhouse effect.
Hope this helps!
-Payshence xoxo