Question
A student sees muscles arranged circularly and longitudinally in an earthworm. Their alternating contraction helps the worm:
Select an option. Your answer will be checked instantly.
Correct Answer: A. Crawl by lengthening and shortening body segments
Explanation:
Earthworms move when circular muscles lengthen segments and longitudinal muscles shorten them. The hydrostatic skeleton gives resistance for these shape changes.
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