4 to 5 minutes.
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On average, humans can survive around 3 to 5 minutes without oxygen before experiencing severe brain damage or death. The exact time can vary based on individual health, fitness, and other factors.
Because plants produce our oxygen and we can't live without oxygen, therefore we need plants to survive.
No
The term that best defines a bacteria that can survive without oxygen is "anaerobic." Anaerobic bacteria do not require oxygen for growth and metabolism.
Most cells can only survive a few minutes without oxygen before irreversible damage occurs. Brain cells are particularly sensitive and can start to die within 5 minutes of being deprived of oxygen. organs like the heart and kidneys can survive a bit longer, up to 20-60 minutes, depending on their metabolic needs.
No, because the atmosphere keeps in all the oxygen. Without the atmosphere the oxygen would escape.