List four benefits to human life by eliminating the use of CFCs.</h2></div>

<span>What is the importance of oxygen in water for living organisms?</span></h2></div>

High BOD indicates</h2></div>

Ultraviolet radiation which is not lethal but harm to the organism is<span><br> </span></h2><…

Decrease in species diversity in tropical countries is mainly due to<span><br> </span></h2></…

_____ shields the surface of the earth from ultraviolet (UV) radiation from the sun.</h2></div>

Concentration of green house gases is increasing due to</h2></div>

In recent year, there has been a growing concern about the gradually increasing average global temperatures. If this tre…