Annelids, such as earthworms, move by contracting longitudinal and circular muscles in an alternating pattern. This causes the body to lengthen and shorten, allowing the worm to move forward. The hydrostatic skeleton of the annelid helps provide structure and support for these movements.

Solved

An Annelid Moves by

Question 66

Multiple Choice

An annelid moves by

A) stretching its longitudinal muscles and pushing its fluid-filled body cavity forward.
B) forming pseudopods.
C) ciliary movement.
D) alternating contractions of longitudinal and circular muscles.
E) contraction of circular muscles, which puts pressure on the hydrostatic skeleton and causes it to extend.

Correct Answer: