Answer:
so that the genetic variations are not directly exact
Explanation:
The answer is <span>d. homologous structures.
Homologous structures are </span><span>similar structures shared by different species. For example, the anatomy of joints in bones of birds and dinosaurs, support the idea that these two groups have a common ancestor. But since these two groups are different enough to be separated into different classes, it can be concluded that they evolved from the common ancestor.</span>
identical twins that were adopted and raised by different families
Explanation:
I would say D. natrural selection
