Final answer:
Autotrophic nutrition utilizes carbon dioxide molecules in the process of photosynthesis, playing a crucial role in the carbon cycle.
Explanation:
Autotrophic nutrition is the process that usually uses carbon dioxide molecules. Autotrophic organisms, such as plants, are capable of producing their own food through the process of photosynthesis, where they convert carbon dioxide into carbohydrates using sunlight. This is a critical part of the carbon cycle, where carbon is converted into living matter and back.
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