1
The diagram below shows part of the human respiratory system.
Which of the following parts are represented by X, Y and Z?
| X | Y | Z | |
| A | Trachea | Alveolus | Bronchus |
| B | Bronchiole | Bronchus | Trachea |
| C | Trachea | Bronchus | Bronchiole |
| D | Bronchiole | Trachea | Bronchus |
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A
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B
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C
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D