The concentration of oxygen in the atmosphere has been near or above its current value for the past
A) 200 million years
B) 542 million years
C) 65 million years
D) 360 million years
Correct Answer:
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Q77: The Cambrian Explosion began approximately
A) 2.1 billion
Q78: Aerobic organisms first started building up oxygen
Q79: Why do we believe the Cambrian explosion
Q80: What is one piece of evidence that
Q81: Once oxygen started to be manufactured by
Q83: The most well-known impact crater in North
Q84: The presence of which rocks show that
Q85: During the Carboniferous Period,
A) the carbon dioxide
Q86: The fossil fuel deposits we use today
Q87: How long did it take for oxygen
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