What is unique about the movement of an earthworm? Explain its movement.
i. How do snails crawl?
ii. What pattern do they make while crawling?
Answers
Explanation:
a.An earthworm moves using circular and longitudinal muscles, as well as bristles called setae. The earthworm can push the setae out of its body to grab the soil around it. To move forward, the worm uses its setae to anchor the front of its body and contracts the longitudinal muscles to shorten its body.
b.A snail uses its single long, muscular foot to crawl on a layer of mucus-like slime that it secretes. ... These waves of muscle contraction and relaxation travel along the central portion of the foot from tail to head. The waves move much faster than the snail itself, and generate enough force to push the snail forward.
c.The snails and slugs propel themselves by generating a series of muscular pulses on their feet. These waves of muscle contraction and relaxation travel along the central portion of the foot from tail to head.