A fluid-filled body cavity that forms completely within the mesoderm of animals is a:

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A coelom is a fluid-filled body cavity that forms completely within the mesoderm of animals. The blastula is an early stage of embryonic development where a hollow ball of cells is formed. The gastrula is a stage of development where the embryo begins to form distinct layers. Protostome and deuterostome are terms used to describe the way in which an embryo develops, with protostomes developing the mouth first and deuterostomes developing the anus first.

A Fluid-Filled Body Cavity That Forms Completely Within the Mesoderm