Question
Which gas was absent from Earth’s original atmosphere and then built up gradually during Precambrian time?
A.
oxygen
B.
water vapor
C.
carbon dioxide
D.
nitrogen
A.
oxygen
B.
water vapor
C.
carbon dioxide
D.
nitrogen
Answers
GPT-4o mini
A. oxygen
Oxygen was absent from Earth's original atmosphere and began to accumulate gradually due to the process of photosynthesis by cyanobacteria during Precambrian time.
Oxygen was absent from Earth's original atmosphere and began to accumulate gradually due to the process of photosynthesis by cyanobacteria during Precambrian time.