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the effect of the relative lengths of daylight and darkness on the physiology and behaviour of an organism.
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
a long tube-like structure that carries bile
muscle found only in the heart and forming the muscle wall (myocardium) of the heart.
lacking a cell-like structure.
the cell organelle responsible for manufacturing and transporting protein and lipids.