Redirected from 691 BC
Decades: 740s BC 730s BC 720s BC 710s BC 700s BC - 690s BC - 680s BC 670s BC 660s BC 650s BC 640s BC
Significant People
... would in the analogous cyclic pathway. Instead, the still-excited electrons are transferred to a photosystem I complex, which boosts their energy level to a higher level ...