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What is the cost-benefit relationship regarding sewage treatment as a method to fight water pollution?
To treat sewage is much cheaper for society. The non treated sewage pollutes rivers, lakes and the sea, being a cause of diseases transmitted by water. For the society the costs of these diseases are much higher than the cost of the sewage treatment.
One of the most economical systems to treat sewage is the aerobic treatment system, reservoirs kept much oxygenated for aerobic bacteria to decompose organic material.
How does iodine kill germs? The microbiocidal action of Iodine is because of the active form, I2, which is polarized by water and like all halogens (chlorine, fluorine, bromine
The gene is a distinct portion of a cell's DNA. Genes are coded instructions for making all the body needs, mainly proteins. Human beings have about 25,000 genes. Researchers have
Excretory organ for protozoa
A v i a n infectious bronchitis (IB) An acute, highly contagious respiratory disease of chicken caused by a member of the family Coronaviridae, IB was first recognized in I
Protoplasm Also known as bioplast . It is gelly like & semi liquid in appearance. It is translucent in nature. It is colourless, oderless, viscous, elastic & granu
What is the Rh typing of the mother and of the fetus in the hemolytic disease of the newborn? In the hemolytic disease of the newborn the mother is Rh- and the fetus Rh+. In th
Briefly explain the following feeding mechanisms in holozoic organisms: filer feeding,fluid feeding and deposit feeding.
why is epidermis peeledsuggest why a marine amoeba does not have a contractile vacuole
Explain about Chlorophylls Chlorophylls are used as colourants in a range of foodstuffs and both natural chlorophyll (containing magnesium as the central metal ion) and 'coppe
Define a liquid diet A liquid diet is the one which having of foods that can be served in liquid or strained forms at room temperature. These are usually prescribed after certa
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