When dry environmental conditions exist, guard cells close the openings in leaves to reduce the loss of water from the plant. this process is an example of a feedback mechanism that plants use in order to a. produce more chlorophyll. b. absorb more solar energy. c. maintain homeostasis. d. expend their resources.

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.

i believe your answer would be c.. : )

it is called the mitotic spindle