Which type of animal could function without a circulatory system?
A) A large, mobile terrestrial animal
B) A large, mobile aquatic animal
C) An active terrestrial animal
D) A small, thin, sedentary aquatic animal
E) A large, slow terrestrial animal

Question

Quizplus · Accepted Answer

A small, thin, sedentary aquatic animal could potentially get enough oxygen through simple diffusion across their body surface without the need for a circulatory system.

Which Type of Animal Could Function Without a Circulatory System