Cyanobacteria are believed to generate the majority of oxygen gas in Earth's atmosphere. What allows them to produce oxygen?
A) photosynthesis in which H2S is the electron source
B) photosynthesis in which water photolysis produces H+, e-, and O2
C) bacteriorhodopsin-based photosynthesis
D) being near the surface of a pond where more oxygen is available
E) possession of a variety of chlorophylls to absorb a wide range of wavelengths of light
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