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competition between organisms of the same species.
the very cold zone in an ocean, dam or a lake, located below the range of effective light...
the outermost layer of the stele or vascular cylinder in a dicotyledonous plant root. Lateral...
a chemical substance found in food that is essential for maintaining life.
a state in which the body has become dependent on a chemical substance in order to function.
the process whereby the products of digestion are transported from the digestive tract into the...