are photosynthetic organisms with both photosystems I and II, hence, evolves oxygen. Most cyanobactera have chlorophyll a only, but exciting new studies show that there are ecologically important members with both chorophylls a and b.
(recognize heterocysts and know their function).
What photosystems are found in heterocysts and how does this relate to nitrogen fixation?
Recognize a stromatolite as a fossil of the Cyanobacteria
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