Basically, photosynthesis is the process by which plants, some bacteria, and some protistans use energy from sunlight to produce sugar, which cellular respiration converts into ATP, which is used by all living things. The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. The photosynthetic process uses water and carbon dioxide and releases oxygen and glucose.
Here is a simplified version of what I have just explained on photosynthesis:
http://www.kscience.co.uk/animations/photosynthsis.swf
http://www.kscience.co.uk/animations/photosynthsis.swf
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