[Solved] Which of the Following Is a Way We Believe That

Question 29
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Which of the following is a way we believe that the early atmosphere of the Earth differed from the atmosphere we have today?

A) there was little if any free oxygen early on
B) there was no ozone layer early on
C) there was probably more carbon dioxide early on than there is today
D) all of the above
E) none of the above

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