Answer:
The genetic variations that are best suited for their enviornment
Explanation:
Those that are not well suited for their environment will die off, leaving only the ones that are suited for it. This species will slowly take hold until the species has adapted and become a completely different one.
I can help you with that, hfnj2013! :3 The cytoskeleton is responsible for the support structure and movement of cells in your body. Hope that helps!!! XP
Because they are built with overlapping sand and they can break easily.
