ANSWER :
1. D (1m)
2. alveolus or alveoli (1m)
3. haemoglobin or haemoglobins (1m)
4. B (1m)
5. Possible correct answers: 10, 11, 12, 9 and 8 (1m) one answer only !
6. tar or tars (1m)
7. carcinogen or carcinogens (1m)
8.
Nose-Trachea-Bronchus-Bronchiole-Alveolus (1m half completed) (2m fully completed)
9. 5 (1m)
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