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I assume you are asking about carbon dioxide.

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Q: What molecule must first be present to begin photosynthesis?
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What is the first molecule to provide electrons for photosynthesis?

Water 


WHO WAS The first chemist to begin quantifying the process of photosynthesis was?

Nicholas de Saussure


Is begun is a present?

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It is unsure were the first oxygen molecule came from came from, but my bet was that it was from the process "Outgassing" in which Water, Carbon Dioxide, and other fluids, were spewed out of volcanoes. The Carbon Dioxide was used by Cyanobacteria, or Stromatolites(sp?),in photosynthesis, thus producing oxygen.


What is the first reaction of the dark of photosynthesis where RuB combined with CO called?

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In which present-day country did the religion of Christianity begin?

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What important process in plants requires water?

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