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•Bilateral symmetry.•Protosomes.•Do not have an anus, but possess a mouth.•Contain a hydrostatic skeleton.•Mostly sexual reproduction.•4 Classes - Monogenea, Trematoda, Turbellaria & Cestodes.•Examples - tapeworms, flatworms, roundworms.

•Sac Body Plan - one opening that functions as the mouth and anus.•3 germ layers.•Live in fresh water, ocean biome, or a moist environment.•

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Q: What are the characteristics of platyhelminthes?
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