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the movement of an organism in response to a one-directional source of light when the stimulus does not determine the direction of the movement.
a form of potential energy stored in chemical bonds and released in a chemical reaction.
the most common and most movable type of joint in the body of a mammal e.g. the elbow.
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
a state in which the body temperature has dropped to dangerously low levels.