Because we breathe it in. If we couldn't breathe, we'd suffocate and die.
Oxygen is the most important factor for living things.
Oxygen is what plants produce that is important to all living things!
Oxygen is important because it permits us to live
oxygen
oxygen and carbon dioxide are the 2 most important gases for living things
oxygen
Both oxygen and nitrogen are equally important to living things. Oxygen is necessary for metabolism to continue. But too much oxygen is poisonous. So the presence of nitrogen keeps the oxygen levels low enough to avoid poisoning.
Chnops make up 98% of the mass of living things
Plants are essential for living things. Plants produce oxygen through a process called photosynthesis. Without plants, there would not be enough oxygen on the planet for all living things to survive. Plants are also a critical part of the food chain.
Oxygen or O2 is not important as a compound itself, but is very important for the survival of most living things, such as humans and mammals. O2 removes the Carbon that is produced in living organism
Carbon, hydrogen, nitrogen, oxygen, phosphorous and sulfur.
carbon oxygen hydrogen nitrogen