The body cavity of coelomate animals develops within the

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Coelomate animals have a true body cavity called the coelom that develops within the mesoderm layer. The endoderm layer develops into the internal organs and the ectoderm layer develops into the outer skin and nervous system. Pseudocoelomate animals have a body cavity that is only partly lined with mesoderm, while animals without a body cavity, such as flatworms, only have two cell layers (ectoderm and endoderm). Mesoglea is a jelly-like substance found in the body of some animals, such as jellyfish, but it does not form a true body cavity.

The Body Cavity of Coelomate Animals Develops Within the