Question

Which two of these characteristics are examples of endoskeletons?

Answer 1

I believe it is C) calcium-rich plates echinoderms and B) bones in mammals like vertebral 

Answer 2

Answer:  

Option B and option C are correct.

Explanation:

Endoskeleton - An internal support structure or skeleton is on the inside of a body, composed of calcium or mineralized tissue.

B. Bones in mammals - are endoskeleton, it supports the body in its shape.

C. Calcium-rich plates in echinoderms are acts like exoskeletons but most of the cases a thin tissue surround skeleton so it is an endoskeleton.