How do flatworms differ from coelenterates?

Intestinal are three-plane coelomates, which are mainly found in aquatic, mainly marine environments. They exist in isolation or as colonies. They are a model of holozoic nutrition, and they have extracellular and intracellular digestion.

Roundworms are a pseudocoleomat, which means they have a body cavity between the mesoderm and the endodermal layers. The roundworm has a complete digestive tract with two separate openings for the mouth and anus.



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