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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.
the outer region of the kidney, grainy in appearance, in which the Bowman's capsules of the...
extremely small infectious particles that can only reproduce inside a host cell.
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
the digestive tract of an animal, made up of different organs, that extends from the mouth to...