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Stoma
01
a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)
02
a microscopic pore found on the surface of leaves and stems of plants, involved in gas exchange, including the uptake of carbon dioxide and release of oxygen and water vapor
Examples
Each stoma on the leaf's surface opens and closes to regulate the plant's water balance.
The number of stomata per square inch on a leaf is influenced by environmental conditions.
