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classification based on embryonic layers...
Explanation:
Those animals have ectoderm, mesoderm and endoderm are Triploblasti animals...
Those animals have only ectoderm and endoderm but not mesoderm are diploblastic animals...
In animal kingdom, phylum porifera to ctenophora are diploblastic animals and phylum platyhelminthes to chordates are triploblastic animals...
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