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There are two main sources of pollution:
(1). Natural Sources:
(a) Volcanic ash
(b) Marsh gas (CH4) released from decay of organic matter.
(c) Dust from dust storm.
(d) Pollengrains, spors, bacteria, cysts etc.
(2). Anthropogenic sources:
Man has aggravated the problem of pollution by his innumerable activities like.
(a) Industrialization
(b) Revolution in automobile industry
(c) Deforestation
(d) Nuclear explosion
(e) Over exploitation of natural resources.
Food Chain The land mass, water bodies and atmosphere are the three endowments of nature on which the living beings have to depend for their nourishment and sustenance. The
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list the major species of echinodermata
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