5.00 points If you have not had the chance to pick up an active night crawler (L

Question

5.00 points If you have not had the chance to pick up an active night crawler (Lumbricus terrestris) on a warm summer night and hold it in your hand then you ought to try it. /It seems that every part of the worm is capable o anging shape, making parts of its body long and skinny or short and fat, and no matter which part you d the rest of it seems to be able bend even to the point of nearly tying itself into a knot. They obviously o not have bones, so what is it that gives its body such shape changing and moving capabilities? O They have repetitive, individually controlled, coelomic cavities with adjustable hydrostatic segments. O The soft body structure. O The development of a peristomium as the first part of the worm. O The presence of an independent nervous system in each segment that operates under its own control.

Explanation / Answer

option A. they have repetitive, individually controlled, coelomic cavities with adjustable hydrostatic segments.

they move by a process known as peristaltic contraction. two muscles circular and longitudinal muscles help in this movement. worm body is a tube filled with fluid and separated into segments. at the end of segment circular muscles and entire segment contain longitudinal muscles. contraction of longitudinal muscle makes segment wide or short.

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