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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.
Class Hirudinea - Classification of Coelom These are leeches. Number of body segments of these types of animals is fixed; usually there are 34 segments in a few groups there m
It contain four steps. They are: Attachment to host Proliferation Invasion of host tissue Toxin-induced damage to host cell
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What can stop a normal cell from growing?
Define the effect of Zinc Deficiency? Zinc deficiency was identified for the first time in 1940 when malnourished Chinese patients were found to have low concentrations of zinc
Which is the part of the human visual system where the receptors that sense light, i.e., the photoreceptor cells, are located? How do those cells work? The photoreceptor cells
Illustrate the metabolism of cornea? Metabolism of Cornea: The corneal epithelium plays several roles in the process of image formation. Its apical cell border interacts
Organization in non-reduced embryo sacs The fate of a nucleus in the embryo sac depends upon its position. Many irregularities in the disposition of nuclei in the early polar
can u show the different activities on the topic
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