Basic General Knowledge
The Rh factor refers to

the ratio of red corpuscles to white corpuscles in the blood
a process that speeds up the clothing of blood
a hormone carried by the blood
a protein substance found in the blood of some people

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Basic General Knowledge
The exhaled air contains

a mixture of carbon dioxide and nitrogen
carbon dioxide only
a mixture which has more carbon dioxide than oxygen
a mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage

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