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The most important biotic factor of sunlight is photosynthesis. Green plants and certain other organisms use the energy of sunlight to convert carbon dioxide and water into the simple sugar glucose by photosynthesis. Plants use glucose to build their cell walls, leaves, flowers, fruits, and seeds. They store extra glucose in the form of carbohydrates in roots, stems, and leaves. The plants can then use these reserves for extra energy or building materials and animals can eat these plants for their nutrition. Nearly all animals depend on glucose for energy, but are unable to produce it themselves. The oxygen animals breathe is the oxygen released by plants during photosynthesis. Humans are also dependent on products of photosynthesis - the natural gas, coal, and oil used as fossil fuels are composed of the remains of organisms that relied on photosynthesis millions of years ago. Nearly all life on earth, directly or indirectly depends on photosynthesis as a source of food, energy, and oxygen, making it one of the most important biochemical processes known.

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