In the process of photosynthesis and cellular respiration carbon dioxide enters and exits the leaves through A)chlorophyll
B)phloem
C)stomata
D)xylem

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Explanation:

The answer is C.stomata.

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.