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640

Centuries: 6th century - 7th century - 8th century

Decades: 590s 600s 610s 620s 630s - 640s - 650s 660s 670s 680s 690s

Years: 635 636 637 638 639 - 640 - 641 642 643 644 645


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Photosynthesis

... up for by taking electrons from a molecule of water, splitting it into O2 and H+. The electrons transfer from the primary acceptor to plastoquinone, then to plastocyanin, ...

 
 
 
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