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Which of the following gases were present in the atmosphere of 4 billion years ago? A) water B) methane C) ammonia D) all of the above
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Which of the following gases were present in the atmosphere of 4 billion years ago?

A) water
B) methane
C) ammonia
D) all of the above

User JasonWyatt
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Answer: D) all of the above

User Lasar
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