Sea Worms. Worms have sensory tissue at one end of the body (a head)They also have simple digestive and excretory systems to circulate nutrients and eliminate wasteSome are parasitic, while others bury under rocks or roam the bottom of the sea. Phylum Platyhelminthes. AKA flatwormsSome are parasitic (like tapeworms of marine and land animals)Are smaller than 3 cm in length and can be found hiding under rocksThey have a central nervous system that is stimulated by eyespots They lack a true 33843
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