Caecilians have no legs. Neither do snakes or whales. Why then do we call them tetrapods? (Hint: Consider their evolutionary histories)

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Plz ! ive been stuck on this forever

Compare the composition of the moon's surface with the composition of the earth's surface.