Question

Which two of these characteristics are examples of endoskeletons?

A. scales in fish



B. bones in mammals



C. calcium-rich plates in echinoderms



D. appendages in arthropods

Answer 1

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

Answer 2

Option B and option C are correct.

Step-by-step 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.