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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.
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.
animal wastes (particularly urine) that contain materials high in nitrogen.