Why Do Living Organisms Need Oxygen?


Living organisms need oxygen to survive. Oxygen is what humans take in when they breathe. The Earth's atmosphere is over twenty percent oxygen. Oxygen is a colorless and odorless molecule. It is considered a gas at room temperature. Oxygen is used to create energy. It is absorbed by the blood stream in the lungs. The cells transports the oxygen. It plays a vital role in our breathing process. Oxygen also plays an important role in metabolism.
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