Jun Jie measured the amount of different gases in inhaled and exhaled air. Based on the table, which gas represents oxygen?
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Worked Solution
Step 1: Inhaled air contains more oxygen than exhaled air because the body uses oxygen.
Step 2: Look for the gas that decreases from Inhaled to Exhaled.
Step 3: Gas P decreases from 21% to 16%, so Gas P is oxygen.
Correct answer: Gas P
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