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the effect of the relative lengths of daylight and darkness on the physiology and behaviour of an organism.
part of cellular respiration: a cyclical series of reactions in which the pyruvic acid formed in...
(also called homeostatic control) the self-regulation and maintenance of a constant stable...
organelles that only occur in the green parts of plants. They contain the green pigment...
found in the cell wall of xylem cells where the secondary cell wall is absent but the primary...