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endocrine gland situated on top of each kidney, which produces hormones in response to stresses to the body.
the non-living ground tissue with thick-walled cells that gives strength, support and protection...
(also called homeostatic control) the self-regulation and maintenance of a constant stable...
series of interlinked food chains by which energy circulates within an ecosystem.
two species that interact symbiotically in a relationship that is beneficial to both species....
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...