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Marine Biology Mod 4 Vocab: Marine Invertebrates I

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Invertebrates   Animals that do not possess a backbone  
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Vertebrates   Animals that possess a backbone  
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Osculum   A large opening on a sponge through which filtered water is expelled  
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Amoebocytes   Cells within a sponge that produce its skeletal structure, perform digestion, and repair cell damage  
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Gemmulealont   A group of cells surrounded by a shell made of spicules  
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Larva   An immature stage of an animal that appears different from the adult stage  
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Metamorphosis   A complete morphological change from larval to adult form  
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Spherical symmetry   A body form in which any cut through the organism's center results in identical halves  
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Radial symmetry   A body form in which any longitudinal cut (along the length)through the organism's central axis results in identical halves  
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Bilateral symmetry   A body form in which only one longitudinal cut through the organism's center results in identical halves  
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polyp   An attached cnidarian stage, appearing sac-like or barrel-like  
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Medusa   A free-swimming cnidarian stage, appearing bell-like or umbrella-like  
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Mesoglea   A jelly-like substance between the inner layer and outer layer of cells in a cnidarian  
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dorsal   Referring to the top (or back) surface of an animal  
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Ventral   Referring to the bottom (or belly) surface of an animal  
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Mutualism   A relationship between two or more organisms of different species where both benefit from the association  
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Commensalism   A relationship between two or more organisms of different species where one benefits and the other is neither harmed nor benefited  
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Parasitism   A relationship between two or more organisms of different species where one benefits and the other is harmed  
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Gills   Extensions of the body containing thin-walled blood vessels that allow for easy absorption of oxygen from the outside surface  
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Coelom   A body cavity within organisms containing specialize tissue  
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