Concerning oxygen, which of the following is FALSE?
A) It was scarce in Earth's early atmosphere.
B) It helped produce the first life on Earth.
C) Most life cannot function without oxygen.
D) Most oxygen has a biological origin.
E) Photosynthesis produces oxygen.

Question

Quizplus · Accepted Answer

Oxygen did not help produce the first life on Earth; rather, the first life forms were anaerobic and did not require oxygen. It wasn't until later that photosynthetic organisms began producing oxygen as a byproduct of their metabolism.

Concerning Oxygen, Which of the Following Is FALSE