Hi there,
The answer to this question is
D. All of these
Changes in different temperature and acidity can change the function of a cell. Acidity and Temperatures are usually balanced for the cell function but one small change in one of them can throw off the cell of the pH levels.
Hope this is correct :)
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I believe it's C, made in light-dependent reactions and used in light-independent reactions.
Relative Humidity is considered as the most important factor in regulating the closing and opening of stomata. Since it indirectly controls transpiration and stomata's main function is transpiration.
Hope this helps!