What is the average life span of a computer?</h2></div>

What happens if the forest area decreases rapidly ?<br> </h2></div>

"BOD is commonly calculated as an index of water pollution."<br> (a) Do you agree with this statement ? …

What does a single chlorine free radical destroy?<span><br> </span></h2></div>

What can be made using bio-degradable waste?

Increasing skin cancer and high mutation rate are the result of _______________.</h2></div>

How does deforestation lead to frequent floods and droughts? </h2></div>

<span>Which of the following prevents afforestation in deserts?</span><br> </h2></div>