ANSWERS: 4
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Photosynthesis.
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photosynthesis
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Photosynthesis.
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"Photosynthesis is the conversion of light energy into chemical energy by living organisms. The raw materials are carbon dioxide and water, the energy source is sunlight, and the end-products include glucose and oxygen. It is arguably the most important biochemical pathway, since nearly all life depends on it. It is a complex process occurring in higher plants, phytoplankton, algae, as well as bacteria such as cyanobacteria. Photosynthetic organisms are also referred to as photoautotrophs. The word comes from the Greek photo-, light, and synthesis, putting together." Source and further information: http://en.wikipedia.org/wiki/Photosynthesis
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