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You Come Across Several Invertebrate Organisms Crawling Through the Sand

Question 147

Multiple Choice

You come across several invertebrate organisms crawling through the sand.You notice that they have a soft body wall, and when you dissect one, you see that it has no rigid structures inside the body.This organism most likely


A) has no skeletal system.
B) uses a skeletal system built by osteoblasts.
C) attaches its internal muscles to an exoskeleton.
D) uses a hydrostatic skeleton to move.
E) uses a skeletal system composed of cartilage.

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