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| A subdivision of the benthic province encompassing the seafloor between the depths of two and six kilometers |
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| A subdivision of the pelagic process lying between the water depths of two and six kilometers |
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| Simple marine and freshwater plants, unicellular and multicellular, that lack roots, stems, and leaves. Examples include diatoms and seaweeds. |
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| The dark region of the ocean that lies below the sunlit surface waters |
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| One of the three taxonomic domains of life; it includes the extremophiles, the archaebacteria that live in enviroments with extreme temperatures, salinities, and pressures. |
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| As applied to the caudal fin of a fish, it is a ratio of the square of the height of the fin to its surface area. Darters and lungers have low aspect ratios, cruisers have high aspect ratios. |
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| One of the three taxonomic domains of life; it includes all true bacteria, which are tiny, unicellular organisms without a nucleus and with simple subcellular structure. |
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| A subdivision of the benthic province encompassing the seafloor between the depths of 200 and 2,000 meters. |
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| A subdivision of the pelagic province lying between the water depths of one and two kilometers |
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| A primary subdivision of the oceans that includes all of the sea bottom |
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| All organisms that live on or within the ocean bottom |
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| Green pigments that are found in plants that are essential for photosynthesis |
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| Organisms that extract food from sediment |
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| The dispersal of material from various molecular movement |
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| The part of the water column that is barely lighted that is between the photic and aphotic zones |
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| The study of interactions of organisms with one another |
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| Organisms that live in contact with the seafloor |
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| Plants living in contact with the seafloor |
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| A portion of the pelagic zone extending down 200 meters from the ocean surface |
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| One of the three taxonomic domains of life, it includes fungi, plants, and animals, all of which are composed of cells with a true nucleus and other complex organelles |
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| A subdivision of both the pelagic and benthic zones |
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| The "rootlike" structures that anchor seaweeds to the substrate |
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| The pressure at a specified water depth that is the result of the weight of the overlying column of water |
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| Animals that live in or borrow through the substrate as distinguished from the epifauna, which live upon the substrate |
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| A subdivision of the pelagic province between the water depths of 200 and 1,000 meters |
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| Animals capable of swimming independantly from water current |
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| A subdivision of the pelagic enviroment; the water that overlies the continental shelf |
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| The deep water of the oceans beyond the shelf break |
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| The process of controlling the amount of water in tissues and cells |
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| The diffusion of water through a semi-permeable membrane |
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| All of the water of the oceans, including the neritic and oceanic realms |
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| The well-lit surface layer of the ocean where plants photosynthesize |
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| The plant members of the plankton community, which are primary producers of the oceans |
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| Chemical reactions conducted in the presence of light by plants using chlorophyll whereby carbon dioxide and water are converted into carbohydrates and oxygen |
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| Organisms that float or have weak swimming abilities, and are waffed by currents |
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| The sudden and rapid multiplication of plankton in a concentrated area |
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| A subdivision of the benthic province extending from the shoreline to a depth of 200 meters |
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