How does the body increase the amount of oxygen to the muscles during exercise?
by exercising longer
by breathing faster
by relaxing
by breathing through your nose

by breathing faster

Explanation:

Anaerobic respiration takes place in muscles of human beings. this happens when we do a more amount of physical work. and sometimes sufficient amount of oxygen is unable to reach the muscles hence anaerobic respiration occurs in muscles and lactic acid is formed

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answer; more than 80% percent of adults;

all the above is what i would say