It is glucose.
Plants use their leaves to trap light energy during photosynthesis. Plants use the sun's energy to convert water and carbon dioxide into glucose, a sugar. Plants use glucose to provide energy and to create other substances such as cellulose and starch.
Plants store glucose in the starch form as a reserve energy supply. Animals that eat starch can break it down into glucose molecules to extract useful energy.
The glucose molecule's primary function is to provide energy; it is a fuel. Glucose is used by plants and animals as a soluble, conveniently distributed form of chemical energy.
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