The Hydrostatic Skeleton of the Earthworm Allows It to Move

Question

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

Accepted Answer

The hydrostatic skeleton of an earthworm uses the pressure of fluid in its body to generate movement by peristaltic contractions of its circular and longitudinal muscles. This allows the earthworm to crawl and twist its body to move around in its environment. Walking on limbs, swimming with setae, and crawling with feet are not methods used by earthworms for movement, and flagella are not present in earthworms.