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Photosynthesis ( ; from the Greek φώτο- [photo-], "light," and [synthesis], "putting together", "composition") is a chemical process that converts carbon dioxide into organic compounds.
Photosynthesis is the source of energy for nearly all life on earth, either directly, through primary production, or indirectly, as the ultimate source of the energy in their food.
As well as energy, photosynthesis is also the source of the carbon in all the organic compounds within organisms' bodies.
The plant gets energy and light from the sun.
Plants get water from the ground through their roots.
Like a recipe, a plant adds a (cup of) water, (pinch) of sunlight, a (teaspoon) of carbon dioxide.
In the process of making this special food, the plant releases oxygen into the atmosphere.