Final answer:
Oxygen is essential for the body to function properly, playing a critical role in cellular respiration and supporting various bodily functions. It helps the brain function optimally, muscles contract during physical activity, removes waste products, and supports the immune system.
Step-by-step explanation:
Oxygen is essential for the body to function properly. It plays a critical role in cellular respiration, the process by which cells produce energy. Without adequate oxygen, the body's organs and tissues cannot perform their functions effectively. For example, oxygen is needed for the brain to function optimally and for muscles to contract during physical activity. In addition, oxygen helps to remove waste products from the body and supports the functioning of the immune system.
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