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| Phylum Platyhelminthes (Flatworms) |
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Simplest triploblastic organisms showing bilateral symmetry |
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Mostly parasites in other animals |
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Body in dorsoventrally flat and leaf-like or ribbon-like with bilateral symmetry |
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The body cavity has only one opening which serves as both the mouth and the anus |
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Hermaphrodites i.e, male and female sex organs present in one individual |
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| Example: Planaria, Liver Fluke, Tape Worm |
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