Which of the following gases was present in Earth's early atmosphere?
A) Water vapor
B) Carbon dioxide
C) Hydrogen
D) Methane
E) All of these gases
Correct Answer:
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Q1: When did the Big Bang occur?
A)3.8 billion
Q2: Scientific knowledge of many events of the
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A)The highly deformed, leading
Q8: Which process is responsible for the oxygen
Q9: What geologic era are we in today?
A)Cenozoic
B)Mesozoic
C)Paleozoic
D)Precambrian
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