When the guard cells close the stomata on the underside of plant leaves, it is in response to-- A). a reduced supply of oxygen
B). a long period of rainfall
C). little available water
D). the sun going down

Below:

Explanation:

Plant cells have a cell wall, but animals cells do not. Cell walls provide support and give shape to plants. Plant cells have chloroplasts, but animal cells do not. ... Plant cells usually have one or more large vacuole(s), while animal cells have smaller vacuoles, if any are present.

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