C4 plants have better water conservation abilities than many other plants (especially C3). This is because:
A) C4 plants have smaller stomata that are protected by hairs and pits.
B) C4 plants have the ability to obtain CO2 without opening their stomata.
C) C4 plants open their stomata at night.
D) C3 plants are able to keep their stomata closed during the day.
E) C4 plants have no leaves; they use their stems for photosynthesis.
C) C4 plants open their stomata at night.
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