What is the main element other than oxygen in air?
Carbon dioxide
Sulfur dioxide
Helium
What does the alveoli do?
Kills bad cells
Helps keep body clean
Makes it easy for oxygen to diffuse
What percent of nitrogen is in the air?
69%
78%
84%
What percent of oxygen is in the air?
12%
7%
21%
What state of matter is air?
Is air important in our lives?
Yes
No
A little
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