Using the terms anterior, posterior, setae, longitudinal muscles and circulatory muscles, describe the movement of the earthworm.
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To burrow through the earth, a worm will flex its circular and longitudinal muscles to make itself long, then will extend the setae on its anterior, or front end to anchor itself in the earth. It will then contract its muscles to make its body short and bring the posterior, or back end, closer to the front.

the correct answer to this question is #5