It took approximately __________ years for oxygen to become a large component of the Earth's atmosphere.
A) 3,000
B) 1 million
C) 3 billion
D) 1 billion

Name: It took approximately __________ years for oxygen to become a large component of the Earth's atmosphere. A) 3,000 B) 1 million C) 3 billion D) 1 billion
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The Answer of It took approximately __________ years for oxygen to become a large component of the Earth's atmosphere.
A) 3,000
B) 1 million
C) 3 billion
D) 1 billion

It Took Approximately __________ Years for Oxygen to Become a Large