Question

Atmospheric oxygen is used by living beings for

Answer 1

Respiration:

1. The majority of living organisms require oxygen.
2. When living cells produce energy, they use this oxygen in the process.
3. Oxygen is cycled through the environment in the same way that water does in the hydrologic cycle, from the sky to the earth and back.
4. Food is broken down by oxygen during respiration to produce carbon dioxide, water, and energy.
5. The oxygen needed for breathing is drawn from the surrounding air by land animals and plants.
6. The series of actions that lead to the exchange of oxygen and carbon dioxide between the atmosphere and the body's cells is known as respiration.
7. The chemical process of respiration, which generates energy and powers the metabolisms of most living organisms, depends heavily on oxygen.
8. The process of photosynthesis is where plants and certain bacteria produce oxygen.
9. Oxygen is both produced and consumed by plants.

Final answer: Plants and animals are dependent on oxygen for respiration.