TRUE OR FALSE
1. The byproduct of photosynthesis is Carbon dioxide.
2. Carbon dioxide is produce during combustion.
3. Oxygen is 78% in the atmosphere.
4. Air in the atmosphere protects us from meteoroids.
5. Humidity is the amount of water vapor in the air. If there is a lot of water vapor in
the air, the humidity will be high.
6. There is more oxygen to breathe at the top of a high mountain than there is at sea
level.
7. During respiration, a living thing takes in oxygen from the air and gives out carbon
dioxide.
8. There's no fire without oxygen.
9. Methane blocks harmful ultraviolet light from the sun.
10. The air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide
because our cells use oxygen from the inhaled air to release energy and give out
carbon dioxide as a byproduct.​