Final answer:
Leaves need carbon dioxide to diffuse in through the stomata for photosynthesis and energy production.
Step-by-step explanation:
Leaves need carbon dioxide to diffuse in through the stomata because it is a crucial component in photosynthesis, the process by which plants convert sunlight into energy. The stomata are small openings on the surface of leaves that allow for gas exchange. Carbon dioxide enters the leaf through the stomata and is used in conjunction with water and sunlight to produce glucose and oxygen. The glucose is then used as a source of energy for the plant's growth and development. Therefore, the diffusion of carbon dioxide into the stomata is essential for the plant's survival and productivity.
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