1) What are some illnesses which can affect the respiratory system?
2) Why is it bad to breathe through the mouth for too long?
3) An oxygen mask provides air rich in oxygen. On what occasions does a person need to put on an oxygen mask?
4) In the beginning, the air on Earth did not contain any oxygen. Do you think there were any plants on Earth then? Why?
5) Why do human lungs have a large surface area?
6) Compare the ways in which nutrients, water and oxygen are transported within plants and humans.
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