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Photosynthesis is used to produce food for plants. Plants are called autotrophs because they produce their own food. Animals are heterotrophs, meaning they eat their food. What do plants produce in photosynthesis that is used by animals and other heterotrophs?

User Elf Sundae
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Like plants, humans and other animals depend on glucose as an energy source, but they are unable to produce it on their own and must rely ultimately on the glucose produced by plants. Moreover, the oxygen humans and other animals breathe is the oxygen released during photosynthesis.

User Henon
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