Each time you take a breath you are bringing in the oxygen you need to stay alive.The ultimate source of the oxygen used by all aerobic organisms comes from a reaction that breaks down

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The ultimate source of the oxygen used by all aerobic organisms is water, which is broken down during photosynthesis in plants and algae. This process produces oxygen as a byproduct, which is then released into the atmosphere and used by organisms for respiration. Carbon dioxide, ATP, and NADPH are all important molecules involved in photosynthesis and cellular respiration, but they are not the ultimate source of oxygen.

Each Time You Take a Breath You Are Bringing in the Oxygen