Question

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 thin out as they stretch. What anatomical feature explains this type of movement? _____ Select one: a. The annelids possess longitudinal muscle fibers that the nematodes lack. b. The nematodes lack circular muscle fibers. c. Nematodes lack a coelom. d. Annelids have a highly specialized nervous system capable of more complex movements.

Answer 1

What anatomical feature explains this type of movement?

B.The nematodes lack circular muscle fibers.

Step-by-step explanation:

Nematodes or roundworms are a an animal phylum inhabiting a broad range of environments, from the Animalia kingdom. They have adapted to almost every ecosystem. They are normally small. They lack circular muscle fibers. Instead, underneath the epidermis they have a layer of longitudinal muscle cells.