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simple inorganic chemical substances (mineral salts) that are needed in relatively large amounts for normal growth and development of a living organism.
the field of study that provides scientific names for organisms, describes them, preserves...
the process whereby a particular change causes a response which reverses that change.
series of interlinked food chains by which energy circulates within an ecosystem.
(also called renal failure) the condition in which the kidneys are no longer able to function...