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Give two characters of Phylum Platyhelmi...

Give two characters of Phylum Platyhelminthes showing a higher body organisation seen than in coelentenates.

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Flatworms are placed above coelenterata because of several advanced features like.
(a) Triploblastic. i.e., having three body layers namely ectoderm , endoderm and mesoderm.
(b) Nervous system , excretory system etc. are better developed.
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