Write one harmful effect of deforestation on environment.</h2></div>

Is it true that if the dissolved oxygen level drops to zero, the water will become septic? Give an example which could l…

What amount of noise may damage eardrums thus permanently impairing hearing ability?

Forest destruction results in<span><br> </span></h2></div>

What happens when the maximum amount of oxygen in the upstream of sewage discharge is utilized by microbes?

Name two natural biopesticides.</h2></div>

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

How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.</h…