Cyanobacteria
a) are poisoned by oxygen
b) are not widely diatributed
c) have chlorophyll
d) have chloroplast
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Cyanobacteria establish symbiosis with plant groups widely spread within the plant kingdom, including fungi (lichenized fungi and one non-lichenized fungus, Geosiphon), bryophytes, a water-fern, one gymnosperm group, the cycads, and one flowering plant (the angiosperm, Gunnera) [2, 35, 36].
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It built up in the water, in the air. To the other bacteria living in the ocean—anaerobic bacteria, remember—oxygen was toxic. The cyanobacteria were literally respiring poison. A die-off began, a mass extinction killing countless species of bacteria.
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