Which event occurred during the Cenozoic era?
Cyanobacteria filled the water and air with oxygen.
Pangaea, the super continent, was formed.
Pangaea began to break apart into many continents separated by shallow seas.
Early humans began to make tools, harvest plants, and make cave paintings.
Answers: 1
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What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen
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Which event occurred during the Cenozoic era?
Cyanobacteria filled the water and air with oxygen.
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