invertebrate vocab
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| spongocoel | central cavity into which water flows through sponge
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| oscula | openings out of which water is expelled
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| epithelial cells | cover outer body; some modified to become porocytes
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| choanocytes (aka collar cells) | maintain feeding current
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| mesohyl | jellylike matrix holding cells together in sponge
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| amoebocytes | digest and distribute nutrients; make reproductive cells
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| spicules | skeletal elements of a sponge
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| mode of reproduction in a sponge | asexual budding or sexual sperm and egg
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| define eumetoszoa | true tissues
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| name the phylum of anemones, corals ad hydras | cnidaria
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| are cnidarians radial or bilateral? diplo or triploblastic | radial and diploblastic
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| name cnidarians' two tissue layers | epidermis and gastrodermis. both layers have filaments that behave as primitive muscles and nerves
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| mesoglea | gelatinous substance that holds tissues together
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| cnidocytes | special cells at tips of tentacles that have poisonous barbs for capturing prey
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| what class are obelia, hydra and portuguese man-o-war in? | hydrozoza
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| what class are jellies, sea wasp and sea nettle in? | scyphozoa
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| what class are box jellies in? | cubazoa
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| what class are coral and anemonies in? | anthozoa
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