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f98u3vocab_ref - Glossary Algae Simple plants without a...

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Glossary Algae - Simple plants, without a true stem, leaves, or roots, and possessing chlorophyll; includes almost all seaweeds. Antennae - A pair of sensory organs which grow from the head of an invertebrate animal. Autotroph - An organism that makes its own food from inorganic compounds such as CO2 or H2O. Bathypelagic zone - The open-ocean environment between the depths of approximately 1000 and 4000 meters (3,000 to 12,000 feet). Benthic - The ocean bottom environment. Benthic organisms live either on the bottom or in the sediment. Bioluminescence - Production of light by an organism. Biomass -Total weight or volume of organisms in a given area. Brotulas - Eel-like fishes of the deep-sea benthos. Buoyant - Capable of staying afloat in a fluid. Caudal peduncle - Region just in front of the tail fin on a fish. Chemosynthesis - A type of primary production (carbon dioxide fixation) carried by some bacteria in the absence of sunlight. Cilia - Short, hairlike, outgrowths on the surface of a cell. Circulatory system - The system by which blood is circulated through the body. Cones - One of the cone-shaped cells in the retina of the eye, sensitive to bright light and color. Crinoids - A group of echinoderms, most are attached to the bottom by a long stalk. Species without stalks swim or creep slowly about. Crustacea -Diverse group of organisms including crabs, lobsters and shrimp. Decomposers - Heterotrophic organisms that break down non-living matter, thereby converting organic compounds into inorganic compounds, which can then be used by plants. Decompostion -The break down of nonliving organic material. Deep scattering layer - Well-defined horizons in the ocean that reflect sonar, usually consisting of fishes, squid, or other larger zooplankton. Demersal organisms - Organisms living on or near the bottom.
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