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In the last unit we traced the human evolutionary history mostly from a palaeontological viewpoint. Although still fragmentary, the available fossil evidence makes it possible to construct a more or less coherent story of human origin and its development. Besides suggesting a primate ancestory, fossil evidence has indicated various trends in human evolution. Today the modern man is regarded as a climax of the evolutionary process. But several questions are raised as to which direction the human evolution is proceeding now and what direction will it take in the future. Is the be-all and end-all of all the evolutionary process? Or do human beings continue to evolve biologically? It may not be possible to provide a direct answer to these questions since evolution is a long term process and the effects could be visualised only after tens of thousands of years.
What is Polysaccharides? Polysaccharides: Many monosaccharide subunits can be joined to form long, complex polysaccharide molecules. These complex sugars are often used to s
Winter Stratification - Thermal stratification During extremes of winter the surface layer of the lake freezes or attains a temperature close to 0° Celsius. Under these condit
What are the main classes into which the phylum is divided? What are some examples of each and in which form (polyp or medusae) are they found? Coelenterates are separated into
Which of the following is true of energy? a. It can be transferred from one form to another with 100 percent efficiency. b. It can be created from nothing. c. It can be stored i
Explain Inhibition of cancer cell proliferation and growth? Vitamin D diminishes proliferation of abnormal intestinal, lymphatic, mammary and skeletal cells and provides a pote
Aim: To prove that Carbon dioxide is essential for photosynthesis. Apparatus: A potted healthy plant with long and narrow leaves, a wide mouthed glass bottle, split cork. Chemicals
For Dalmation dog, the spotted condition is dominant to non-spotted. a) Using a Punnet square, show a cross between two heterozygous parents. b) A spotted female Dalmation dog is m
Indications for Surgery : 95 per cent of ventricular aneurysms occur after transmural myocardial infarction. Trauma, Chaga's disease, sarcoidosis and congenital causes are the ot
Advantages of mucoperiosteal flap There is no tissue loss It is advantageous in cases where there is deficiency of keratinized tissue and the soft tissue is not lost, but ma
Lipid Digestion Digestion of fats is also similar in both invertebrates and vertebrates. Lipases are the - enzymes that hydrolyse fats. A single lipase can catalyse many step
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