A stoma (plural form: stomata) is a pore that is used by plants for gas exchange. This is the site where carbon dioxide enters and oxygen exits.
Stomata are found
A. in leaves, roots, and stems of plants because they are necessary for intake of nutrients.
B. on either the top or bottom leaf surface.
C. in leaves of plants that live in dry places and in stems of plants that live in forests.
D. only on the edges of tree leaves.
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