Answer:
C. maintain homeostasis.
Explanation:
A stoma is formed by the guard cells and the ostiol, a small opening. It is this opening that connects the external environment to the interior of the plant's tissues, an intercellular space called the sub-stomatic chamber. By controlling the opening and closing of ostioles, the plant is able to control homeostasis within the leaf, by controlling the entry of gases and preventing exaggerated water loss. In this way, the plant allows the complete balance of your organism.
