35) Cyanobacteria are photosynthetic bacteria that oxygenate…

35) Cyаnоbаcteriа are phоtоsynthetic bacteria that oxygenated the earth around 2.3 billion years ago.  In regard to photosynthesis in these organisms, what do they use as a  source of electrons? A) O2 B) H2O C) NADPH D) CO2