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invisible, short-wave radiation emitted by the sun, which can cause cancer in humans.
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...
the main force responsible for the upwards movement of water in the xylem.
the movement of molecules across a membrane against the concentration gradient, from an area of...
a special kind of biological identification key which consists of sets of organised pairs of...
a biological membrane that separates the interior of all cells from the outside environment.