Which statement about oxygen is true?

Question

Quizplus · Accepted Answer

Oxygen made aerobic heterotrophic life possible, as these organisms require oxygen to breathe and release energy from food. Prior to the presence of oxygen in the atmosphere, anaerobic organisms were dominant.

Answer: B
 Oxygen allowed for the evolution of autotrophic organisms by providing a powerful electron acceptor for photosynthesis. This allowed certain organisms to create their own energy stores, which in turn allowed for the development of higher trophic levels in ecosystems.

Therefore, both options D and B are correct, but D is a better choice as it is the most directly linked benefit to the presence of oxygen.

Which Statement About Oxygen Is True