5.00 points If you have not had the chance to pick up an active night crawler (L
ID: 187250 • Letter: 5
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.