According to Geological Evidence and Computer Models Based on That

question 7

Multiple Choice

According to geological evidence and computer models based on that evidence,which statement about the concentration of oxygen in our atmosphere is correct?

• A)No oxygen was present prior to the Cambrian Era;oxygen levels have uniformly risen since,and today's atmosphere is more oxygen rich than at any time in Earth's history.
• B)Oxygen levels were greatest during the Cambrian Era but have been steadily declining ever since;today's atmosphere is less oxygen rich than at any time in Earth's history.
• C)Oxygen levels have generally risen during the Phanerozoic Era but peaked during the Mesozoic Era (Age of Dinosaurs)and declined sharply in the Early Cenozoic Era.
• D)Oxygen levels have generally risen during the Phanerozoic Era but peaked during the Late Paleozoic Era (the time of coal swamp forests)and declined sharply in the Early Mesozoic Era.

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