+Flatworms are simple, soft-bodied [invertebrates](/wiki/invertebrate), gracefully flattened and unsegmented. They embody [bilateral symmetry](/wiki/bilateral_symmetry), appearing as free-living aquatic forms or as internal parasites.
+## See also
+- [Worm](/wiki/worm)
+- [Parasite](/wiki/parasite)
+- [Anatomy](/wiki/anatomy)
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