How many germ layers originate the body of platyhelminthes? In relation to this characteristic how are these animals classified?

How many germ layers originate the body of platyhelminthes? In relation to this characteristic how are these animals classified?
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Platyhelminthes are the first triploblastic animals (remember that cnidarians are diploblastic), i.e., they present three germ layers: ectoderm, mesoderm and endoderm.
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