The destruction of forests for agricultural and commercial reasons has upset the _____________ balances.</h2></…

Which one of the following ways can be used to control global warming?

Which of the following does not contributes to greenhouse effect?</h2></div>

Identify the harmful radiations emitted by the sun.</h2></div>

What suggestions will you give to save an imbalanced ecosystem ?</h2></div>

Farming without the use of chemicals as fertilizers, herbicides and pesticides is known <span>as…

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

Ozone layer depletion may lead to which of the following harmful effects in organisms?</h2></div>