Between the organs and the body wall, complex animals have a body cavity called a:

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The body cavity found between the organs and the body wall in complex animals is called a coelom. A coelom is a fluid-filled space that is lined with mesoderm, which allows for better movement and support of internal organs. the other choices are incorrect; cnidarian refers to a type of aquatic invertebrate, mesoderm is the germ layer that gives rise to muscles and other internal organs, mesoglea is a gel-like substance found in cnidarians, and thorax refers to the body section between the head and abdomen in insects and other arthropods.

Between the Organs and the Body Wall, Complex Animals Have