B is the answer and I hopes this helps
Answer:
They are single celled organisms.
Explanation:
I believe your answer would be Echinoderms and Chordates. I hope this helps!
Answer:
I think it is c since "A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment. "
