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two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to enter and leave the leaf. The guard cells regulate the size of the pore in order to control the exchange of respiratory gases and the rate of transpiration.
(also called physical digestion) the breaking down of food into smaller pieces using mechanical...
the non-living ground tissue with thick-walled cells that gives strength, support and protection...
breaking down of large nutrient molecules using chemical means (e.g. through the action of...