Upon Close Inspection of Movement in Annelids and Nematodes, You

Multiple Choice

Upon close inspection of movement in annelids and nematodes, you would notice an obvious difference. Nematodes tend to wriggle back and forth, while annelids tend to contract along their length as their girth swells and then thins out as they stretch. What anatomical feature explains this type of movement?

A) The annelids possess longitudinal muscle fibers that the nematodes lack.
B) Nematodes lack a coelom.
C) The nematodes lack circular muscle fibers.
D) Annelids have a highly specialized nervous system capable of more complex movements.