Basic General Knowledge
The main objectives of the UN are

to develop friendly relations among nations
to work together to remove poverty, disease and illiteracy and encourage respect for each other's rights of basic freedom.
to maintain peace and security in the world
All of these

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Basic General Knowledge
The exhaled air contains

carbon dioxide only
a mixture of carbon dioxide and nitrogen
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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