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5. True or False. If False, give the correct statement I

1. Inhaled air contains a large amount of carbon-di-oxide.

The statement is

Inhaled air contains a large amount of nitrogen
Inhaled air contains a large amount of oxygen

2. Planting trees help in decreasing global warming.

The statement is

Planting trees help in maintaining nitrogen
Planting trees help in maintaining carbon-di-oxide

3. The composition of air is always exactly the same.

The statement is

The composition of air changes only in coastal area
The composition of air changes from place to place

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