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Invertebrate Circulatory System

How things move
AB
poriferadiffusion
cnideranutrients absorbed by specialized cells lining the body cavity
platyhelminthesit's diffusion
nematodagas exchange between cells and fluid-filled cavities
molluscaopen in most, closed in cephalopods
annelidaclosed
arthropodait's open
echinodermataopen again

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