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Number of germ layers which originate platyhelminthes

What is number of germ layers which originate in the body of platyhelminthes? In relation to this characteristic how are such animals categorized?

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Platyhelminthes are the primary triploblastic animals (keep in mind that cnidarians are diploblastic), that is, they present three germ layers: mesoderm, ectoderm and endoderm.

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