Bladder, I believe. But they are saying that my answer must be 20 Characters long...
Answer:
A
Explanation:
In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, alters biotic interactions or opens new environmental niches.
Obviously solids since they’re at the solid stage
They are all layers of the earth
The cell membrane, and probably the cytoplasme