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

Aerobic Respiration

A metabolic process in which cells use oxygen to break down glucose and other molecules, producing carbon dioxide, water, and energy in the form of ATP.

Selective Advantage

A genetic or behavioral characteristic that improves an organism's ability to survive and reproduce in its environment.

Oxygen

A chemical element with symbol O and atomic number 8, essential for aerobic respiration in living organisms and a component of the Earth's atmosphere.