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internal fertilization

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Flatworm Animation: Reproduction

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Flatworms: The First Hunter

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abalone acrorhagi amphioxus anemone anemone fights anemone toxin annelid arthropod backbone bilateral burrow burrowing cambrian camouflage cell to cell communication central nervous system choanocyte chordate chromatophore cilia cnidarian cnidarian body form crab dinosaur dna dragonfly earthworm echinoderm eggs evolution exoskeleton experiment feeding filter feeding flatworms foot fossil genes gill slits hermaphrodite hermaphroditic hunter hydraulic internal fertilization jellyfish jet propulsion jointed appendages land invasion leech mantle marine medusa mollusc mud flat nautilus nematocyst nematocyst firing nematocyst structure nerve chord notochord octopus origins paleontologist paleontology parasite pharynx planaria planarian polyp predation prey reproduction sea cucumber sea star sea star feeding sea urchin segmentation setae skeleton spicules spider sponge identification sponges sponge skeleton sponge taxonomy squid starfish stereo senses stomach symmetry tapeworm taxonomy tentacle terrestrial arthropod toxin trachea tracks urchin vertebrate worm

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