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Definition
| animal that does not have a backbone or vertebral column |
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| animal that has a vertebral column, or backbone |
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| body plan in which body parts repeat around the center of the body; characteristic of sea anemones and sea stars |
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| body symmetry in which only a single imaginary plane can divide the body into two equal halves |
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| specialized cell in sponges that uses a flagellum to move a steady current of water through the sponge |
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| a large hole at the top of the sponge that water and waste leave through |
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| spike-shaped structure that makes up the skeletons of harder sponges; made of either chalklike calcium carbonate or glasslike silica |
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| specialized cell in a sponge that makes spicules |
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| process in which eggs are fertilized inside the female’s body |
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| immature stage of an organism that looks different from the adult form |
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| group of archaeocytes surrounded by a tough layer of spicules; produced by some sponges |
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| stinging cell located along the tentacles of cnidarians; used for defense and to capture prey |
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| stinging structure within each cnidocyte of a cnidarian that is used to poison or kill prey |
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| usually sessile stage of the life cycle of a cnidarian that has a cylindrical body with arm-like tentacles |
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| motile stage of the life cycle of a cnidarian that has a bell-shaped body |
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| loosely organized network of nerve cells that together allow cnidarians to detect stimuli |
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| layers of circular and longitudinal muscles, together with the water in the gastrovascular cavity, that enable movement |
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Definition
| process in which eggs are fertilized outside the female’s body |
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