If you were able to travel back in time 4 billion years to when life first appeared on Earth,what feature of Earth would make it immediately impossible for you to survive?
A) The high ozone content of the air would interfere with metabolic processes.
B) There would be no water on Earth.
C) There would not be enough ultraviolet radiation to support photosynthesis.
D) There would not be any protein-containing organisms for food.
E) The oxygen content of the air would be too low to support aerobic metabolism.

Question

Quizplus · Accepted Answer

The oxygen content of the air was extremely low 4 billion years ago, making it impossible for humans, who rely on aerobic metabolism, to survive.

If You Were Able to Travel Back in Time 4