how did cyanobacteria affect Earth’s early atmosphere?
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A.They replaced oxygen with carbon dioxide in the atmosphere.
B.They eliminated the harmful ultraviolet rays of the Sun.
C.They replaced carbon dioxide with oxygen in the atmosphere.
D.They absorbed ozone molecules from the atmosphere.
B.They eliminated the harmful ultraviolet rays of the Sun.
C.They replaced carbon dioxide with oxygen in the atmosphere.
D.They absorbed ozone molecules from the atmosphere.
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The answer istiny organisms known ascyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.
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