The hydrostatic skeleton of the earthworm allows it to move around in its environment by
A)walking on its limbs.
B)crawling with its feet.
C)swimming.
D)using peristaltic contractions of its circular and longitudinal muscles.
E)alternating contractions and relaxations of its smooth muscle.

Question

Quizplus · Accepted Answer

The hydrostatic skeleton of the earthworm is made up of fluid-filled compartments surrounded by circular and longitudinal muscles. By using peristaltic contractions of these muscles, the earthworm is able to move through its environment without limbs or feet.

The Hydrostatic Skeleton of the Earthworm Allows It to Move