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Biology 14 Online
OpenStudy (anonymous):

What are the small "mouths" on the underside of a leaf that gases and water can pass through? Xylem and phloem Chlorophyll Thylakoids Stomata

OpenStudy (forevershorty):

The openings are stomata or stoma for a single opening. Each stoma is bordered by a pair of guard cells that can open and close the stoma.

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