Question

1-the concentration of_________ is more in polluted areas .
2-the parts through which plant breathe on water surface _________ .
3-increased humidity means increased presence of ________ in air .
4-__________and __________ are inert gases .
5-the gaseous envelope surrounding the surface of earth is called ____________ .

Answer 1

3. water vapour
4. neon and argon
5. atmosphere