You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?
A) It is triploblastic.
B) It has bilateral symmetry.
C) It possesses sensory structures at its anterior end.
D) Muscular activity of its digestive system distorts the body wall.

Question

Quizplus · Accepted Answer

Muscular activity of the digestive system distorting the body wall would indicate that the organism lacks a coelom, as the muscles would be attached directly to the body wall rather than suspended in a fluid-filled cavity. The other options (triploblastic, bilateral symmetry, and sensory structures) are not exclusive to acoelomate organisms.

You Have Before You a Living Organism, Which You Examine