Answer:
Permanent brain damage begins after only 4 minutes without oxygen, and death can occur as soon as 4 to 6 minutes later.
Explanation:
So a person can survive 4 to 6 minutes without oxygen, but may experience brain damage.
The answer is 20 minutes. You must have 20 minutes of cardio each day to have an effective cardio exercise.
D Type. He is changing the type of activity he is doing for his bike-riding routine.
