Oxygen is a chemical element with symbol O and atomic number 8. It's essential for life on earth because it's part of the air we breathe and water we drink.
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Oxidation: The process or result of oxidizing or being oxidized; loss of electrons during a reaction by a molecule, atom or ion.
Respiration: The process by which cells break down simple food molecules such as glucose and release the energy they contain.
Ozone Layer: A layer in Earth's atmosphere containing relatively high concentrations of ozone (O3). It absorbs most of the Sun's ultraviolet radiation.