Showing posts with label The exhaled air contains page 439. Show all posts

Showing posts with label The exhaled air contains page 439. Show all posts

Sunday, 20 December 2015

The exhaled air contains

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439. The exhaled air contains

A.  carbon dioxide only
B.  a mixture which has more carbon dioxide than oxygen
C.  a mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage
D.  a mixture of carbon dioxide and nitrogen

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