Which two animals have no distinct circulatory system?
A) grasshopper and fish
B) grasshopper and hydra
C) hydra and fish
D) sponge and fish
E) sponge and hydra

Question

Quizplus · Accepted Answer

Sponges and hydras lack a distinct circulatory system. Sponges rely on the movement of water through their bodies for the exchange of nutrients and waste, while hydras use diffusion across their body wall.

Which Two Animals Have No Distinct Circulatory System