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what is coelom?
A coelom  is a fluid-filled body cavity found in most animals. It is located in the mesoderm, the middle germ layer only found in triploblastic (three-layered) organisms. Simpler animals like cnidarians (jellyfish, coral, etc.) and sponges are diploblastic and monoblastic respectively, lacking a coelom. Though the cavity developed in triploblastic animals, some of these animals have lost it.
Animals with a coelom, including the majority of animal phyla, are called coelomates.


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