Which of the following best describes a characteristic of aerobic organisms?

Aerobic organisms are defined by their dependence on oxygen for their metabolic processes. These organisms utilize oxygen to efficiently convert nutrients into energy through cellular respiration. This process involves using oxygen to break down glucose, leading to the production of energy (in the form of ATP), carbon dioxide, and water. This characteristic is crucial for their survival and growth because, without oxygen, they cannot effectively produce the energy required for essential biological functions.

The other options do not accurately reflect the nature of aerobic organisms. Organisms that thrive without oxygen are classified as anaerobic, and those that can only live in high-altitude environments are not limited to aerobic or anaerobic status. Additionally, while some organisms can adapt to various oxygen levels, aerobic organisms specifically require oxygen to sustain their life processes, distinguishing them from others that can thrive under different conditions.