<p><strong>Fig. 3.41.</strong>&nbsp;(<strong>B</strong>) This animated image (click the image to see the animation) shows the typical crawling locomotion of nematodes. <em>Caenorhabditis elegans</em> is commonly used as a laboratory test model organism.</p>

Fig. 3.41. (B) This animated image (click the image to see the animation) shows the typical crawling locomotion of nematodes. Caenorhabditis elegans is commonly used as a laboratory test model organism.

Photo courtesy of Bob Goldstein, Wikimedia Commons