Some bacteria also perform anoxygenic photosynthesis, which use bacteriochlorophyll to split hydrogen sulfide as a reductant instead of water, and sulfur is produced as a byproduct instead of oxygen. Photosynthesis is largely responsible for producing and maintaining the oxygen content of the Earth's atmosphere, and supplies most of the biological energy necessary for complex life on Earth. Most plants, algae and cyanobacteria perform photosynthesis such organisms are called photoautotrophs. The term usually refers to oxygenic photosynthesis, where oxygen is produced as a byproduct, and some of the chemical energy produced is stored in carbohydrate molecules such as sugars, starch and cellulose, which are synthesized from endergonic reaction of carbon dioxide with water. Photosynthesis (from Greek phōs ( φῶς), "light", and synthesis ( σύνθεσις), "putting together" ) is a biological process used by many cellular organisms to convert light energy into chemical energy, which is stored in organic compounds that can later be metabolized through cellular respiration to fuel the organism's activities. Dark red and blue-green indicate regions of high photosynthetic activity in the ocean and on land, respectively. Composite image showing the global distribution of photosynthesis, including both oceanic phytoplankton and terrestrial vegetation. The carbohydrates produced are stored in or used by the plant. Biological process to convert light into chemical energy
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