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

Question

Quizplus · Accepted Answer

All three statements are believed to be true about the early atmosphere of Earth. There was little free oxygen, no ozone layer, and likely more carbon dioxide than there is today.

Which of the Following Is a Way We Believe That