discover of harappan civilization
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Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities. Wikipedia
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Discovery and excavation
In 1912, Harappan seals with then unknown symbols were discovered by J. Fleet, which triggered an excavation campaign under Sir John Marshall in 1921/22, resulting in the discovery of a hitherto unknown civilization by Dayaram Sahni.
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