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Answer and explanation:
Oxygen helps organisms grow, reproduce, and turn food into energy. Humans get the oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells the ability to break down food in order to get the energy we need to survive
Answer:
Oxygen is neccessary for many chemical reactions in our body.
Step-by-step explanation:
Many chemical reactions require Oxygen as a reactant to form energy.