Question

Fill in the blanks 

1. Air is colorless, odourless ……………. and ………… . 

2. This component is , which is ……….. approximately 78 percent of the total air.

3. Animals and plants give out ………… in the atmosphere.

4. The gases of atmosphere have a fixed …………

Answer 1

1. tasteless

2. nitrogen

3. carbon dioxide 

4. ratio