Question

Expired air contains about it 0.4% of carbon dioxide.
true
flase

Answer 1

Answer:

.........................

Explanation:

The percentage of oxygen and carbon dioxide in inhaled air is 21% and 0.04% respectively. During respiration, oxygen is used up by the cells producing carbon dioxide. The percentage of carbon dioxide in exhaled air is 4.4% and oxygen is 14-16% and nitrogen is 78%. 

Answer 2

Answer:

true

Explanation:

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