Which of the following accurately reflects the beliefs on Earth's early history?
A. Scientists believe that microspheres nearly prevented the development of early life.
B. Scientists believe the early atmosphere lacked the oxygen necessary to support modern human life.
C. Scientists believe that DNA may have existed before RNA.
D. Scientists believe oxygen was plentiful in the early atmosphere.
Because the was not as much life on earth , the need for oxygen was not need as much in the atmosphere, and I just took the test and D was the right answer.
