8. Read the passage given below:
1) The Earth is the only planet endowed with an environment. The thin cover of air and water that
surrounds the earth is known as the biosphere and it protects and sustains life. The biosphere is a
maintained and established by the life-cycle of plants, animals and bacteria. Without the biological
finely balanced. Mixture of oxygen, nitrogen, carbon dioxide, argon and water vapour. It has been
processes that have gone on in the soil for thousands of years, we could neither have coal, oil nor
food crops. Without the photosynthetic activity of green plants, there would be no oxygen to
support human or animal life. Similarly, for the supplies of pure water, we have to be thankful to
myriads of microorganisms in the aquatic system as well as to the actions of numerous plants and
animals.
2) Man has always made use of his inventive genius to force nature to yield its secrets. He has made
spectacular breakthroughs in technology firmly believing that the sort of progress he is making is an
unmixed blessing. He has seldom given thought to the fact that the air he breathes, the water he
drinks, or the food he eats could be exhausted. And so would be the rich raw materials which he
makes the earth yield. He has always assumed the bounties of nature to be inexhaustible. However,
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