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i'll write about phylum ctenophora

ctenophores, commonly known as sea walnuts or comb jellies are exclusively marine , radially symmetrical ,diploblastic organisms with tissue level of organization. The body bears 8 external rows of ciliated comb plates, which help in locomotion

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Platyheminthes is 3rd phylum in Kingdom animalia. They've flat ribbon like body which is bilaterally symmetrical.It has 3 layers of cells(triploblastic).They are either parasitic or free living. e.g.Tape worms, Planar a, Liver fluke.
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