Why was the development of aerobic cellular respiration a significant event in the evolution of life on earth?

The endosymbiosis of the mitochondria created a cell that depends on the aerobic respiration orchestrated by the mitochondria itself, which made it possible to compose a group composed of relatively more developed episodes than those of the anaerobic species.

Aerobic respiration has a higher energy yield, and is less expensive in fuel (carbohydrates), which has allowed aerobic species to evolve over time.