In which animals would diffusion alone not be an effective transport mechanism for gas exchange?
A) nematodes
B) sponges
C) cnidarians
D) annelids
E) flatworms

Question

Quizplus · Accepted Answer

Annelids have a more complex body structure and larger size compared to the other animals listed, making diffusion alone insufficient for effective gas exchange. They require a circulatory system to transport gases efficiently.

In Which Animals Would Diffusion Alone Not Be an Effective