Question

The oxygen revolution changed Earth’s environment dramatically. Which of the following adaptations took advantage of the presence of free oxygen in the oceans and atmosphere? Select one of the options below as your answer. A. The evolution of cellular respiration, which used oxygen to help harvest energy from organic molecules. B. The evolution of chloroplasts. C. The persistence of some animal groups in anaerobic habitats.

Answer 1

The correct answer from the choices listed above is option A. Adaptations took advantage of the presence of free oxygen in the oceans and atmosphere by the evolution of cellular respiration, which used oxygen to help harvest energy from organic molecules.