I think the answer is D. ( or supported by observations ). Because theories change over time, they both NEED to be proven, they do NOT go off of consensus, but they do NEED to be supported by observations.
I hope this helps.
I believe it is Nerve Cells
Correct me if I'm wrong.
Answer: C.
Explanation: science involves data of the natural world and is gathered everyday which makes different observations b
Explanation: I think camouflage method or a design that scares away predators.