Question

B. Fill in the blanks.
1. A fire cannot be lighted if there is no
2. The air becomes
as we go
3. Contamination of atmosphere causes
pollution.
impurities are left behind after evaporation.
5.
water is widely used in injections and medicines.
6.
travels through air.
4.​

Answer 1

Answer:

1.oxygen

3.air

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