This process, called photosynthesis, is used by plants and some protists, bacteria, and blue-green algae. In photosynthesis, carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. In plants, photosynthesis occurs mainly within the leaves. Since photosynthesis requires carbon dioxide, water, and sunlight, all of these substances must be obtained by or transported to the leaves for photosynthesis to occur.
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