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1. the diagram below shows the human respiratory system.

a. label the above diagram by filling in the boxes. [3]

1- box under nose
2- box under right lung
3- box under pharynx
4- box under box 3
5- box under box 4
6- box under left lung
7- box under box 6

b. i. state one function of the trachea. [1]

ii. explain how the structure of the trachea supports its function in (bi). [2]