Which of these statements most accurately describes how carbon dioxide enters a leaf? A. CO2 is pulled in by leaf veins. B. CO2 is carried by water in leaf veins. C. CO2 defuses by way of the stomata. D. CO2 enters a leaf through osmosis.

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C. CO2 diffuses by way of the stomata. When the stomata opens up through the process of transpiration CO2 enters into the leaves where it is used up in photosynthesis to form glucose.

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