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| animals in the phylum cnidaria; they have radial symmetry, tissue-level organization; and tentacles with nematocysts, specialized stinging structures |
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| the sessile, sac-like stage, with the mouth and tentacles on top |
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| the swimming, bell-like stage, with the mouth and tentacles underneath |
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| primary producers and consumers that drift with the currents |
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| dinoflagellates that live within animal tissues |
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| the iving together in close association of two different species, often divided into patasitism, where one species benefits at the expense of the other; commensalism, where one species benefits without affecting the other; and mutualism, where both species benefit |
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| CO2+H20+sun energy --> organic matter+02 |
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| particles of dead organix matter |
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| red algae that deposit calcium carbonate in their tissues |
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| small, colonial, encrusting andimals that make delicate, often lacelike, skeletons |
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| protozoans, often microscopic, with a calcium carbonate shell |
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| a complicated set of calcium teeth and associated muscles that is found in sea urchins |
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| the steadiest winds on earth, blow from latitudes of about 30 degrees toward the equator |
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| the slow sinking into the mantle of a part of the earth's crust that contains a landmass |
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| the conversion of carbon from an inorganic form, carbon dioxide, into organic matter by autotrophs, that is, the production of food |
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| the conversion of nitrogen gas into nitrogen compounds that can be used by primary prducers as nutrients |
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| the elimination of one species by another as a result of competition |
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| the combination of what a species eat, where it lives, hot it behaves, and all the other aspects of its lifestyle |
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| water-filled tubes possessed only by echinoderms, many of which end in a sucker and can be extended and contracted to grip things and to move around |
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| molluscs whose shells consist of eight overlapping plates on their upper, or dorsal, surface |
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| molluscs whose shells consist of eight overlapping plates on their upper, or dorsal, surface |
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| a symbiont that is not completely dependent on its paerner and can live outsife the symbiosis |
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| one that depends on its partner and does not occur outisde the symbiosis |
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