The Locomotive Behavior of Earthworms Is Enabled by Contraction of Their

Multiple Choice

The locomotive behavior of earthworms is enabled by contraction of their longitudinal and circular muscles; this is seen through their typical burrowing behavior. Nematodes, however, contract their longitudinal muscles against the pressure of fluid in their bodies to produce a whiplike motion that enables them to move. Suppose you place an earthworm and a nematode in a watery solution. Which do you think would be able to move more easily, and why?

A) the earthworm, because it uses two sets of muscles to help it move through the watery solution
B) the nematode, because its whiplike motion will easily propel it through the watery solution
C) the earthworm, because it can contract and expand its muscles to burrow down through the watery solution
D) the nematode, because it can move its paddle-like appendages on its segments to help it move through the watery solution