How do you loose oxygen

Choke yourself or your lungs collapse or they get full or u just breath out

Explanation:

Without oxygen, your brain, liver, and other organs can be damaged just minutes after symptoms start. Hypoxemia (low oxygen in your blood) can cause hypoxia (low oxygen in your tissues) when your blood doesn't carry enough oxygen to your tissues to meet your body's needs. The word hypoxia is sometimes used to describe both problems.

you can loose oxygen if your throats pathway gets blocked

Explanation:

the answer is 250 percent.