List the three things, or reactants, needed for photosynthesis to occur and describe where plants obtain each reactant in an ecosystem.

To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots. Plants also require water to make their food. Sunlight is absorbed by chlorophyll. Water is also a product of photosynthesis. This water is produced from the oxygen atoms in the carbon dioxide molecules.

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