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O-LevelBiologyRespiration5090/11 · Oct/Nov 2012 · Q161 Mark

The table shows the percentage composition of four samples of air. Which sample has been breathed out by a person?

AA

BB

CC

DD

✓ Correct answer

B: B

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About this question

Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2012 Paper 1 Variant 1, question 16.

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