The alternation of circular muscle contraction and longitudinal muscle contraction allows the earthworm to move forward.What type of support system aids locomotion in the earthworm?
A)an exoskeleton
B)an endoskeleton
C)a calcium carbonate shell
D)a hydrostatic skeleton

Question

Quizplus · Accepted Answer

Earthworms have a hydrostatic skeleton, which consists of fluid-filled coelomic cavities that provide support and facilitate movement through muscle contractions.

The Alternation of Circular Muscle Contraction and Longitudinal Muscle Contraction