A coelom differs from a pseudocoel in that

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A coelom develops within the mesoderm, while a pseudocoel is enclosed by mesoderm only on the outside. This means that a coelom is entirely surrounded by mesoderm, while a pseudocoel is not. Additionally, coeloms are found in many animals, including some invertebrates and all vertebrates, and serve several important functions, such as providing a space for organ development and movement, acting as a hydrostatic skeleton, and facilitating nutrient and waste transport. Pseudocoeloms, on the other hand, are found mainly in invertebrates and are less complex in structure and function.

A Coelom Differs from a Pseudocoel in That