A rise in oxygen in Earth's air and seas put organisms that engaged in ____ at a selective advantage.
A)aerobic respiration
B)fermentation
C)photosynthesis
D)sexual reproduction
E)anaerobic respiration

Question

Quizplus · Accepted Answer

A rise in oxygen would benefit organisms that engage in aerobic respiration, as they require oxygen to produce energy. Fermentation and anaerobic respiration do not require oxygen and photosynthesis produces oxygen, but does not directly utilize it for energy production. Sexual reproduction is not directly related to oxygen levels.

A Rise in Oxygen in Earth's Air and Seas Put