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2. The gas we breathe in.
3. Long hollow tube that connects to the lungs.
4. Gas that we breathe out.
5. Breathing out air.
6. Breathing in air.
Q3. Write true or false for the following statements:
a) Exhalation means breathing in air. ________________
b) We have a pair of lungs in our body. ________________
c) Tiny hairs are present in the trachea. ________________
d) We inhale oxygen and exhale carbon dioxide. ________________
e) We should cover our face while sleeping. ________________
Q4. Give reason for the following statements:
a) We should not breathe through our mouth.
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b) Never cover your face while sleeping.
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