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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.
Define the Water activity - Microbial Survival? It is the amount of water available to the organism. In general, requirement for water activity is more for bacteria (minimum 0.
Q. Fluids requirement in ulcerative colitis? Fluids: A liberal intake of fluid should be given to prevent dehydration. The passage of at least 1200 ml of urine indicates that a
Define cause of vitamin a deficiency - Poverty and ignorance? Low purchasing power of the communities and their consequent inability to meet the nutrient requirements and tradi
How many pairs of electrons do the two oxygen atoms in an oxygen molecule share with each other? Explain your answer. The oxygen atoms share two pairs of electrons, sinc
Characteristics of Nutrient Uptake These results show certain characteristics of nutrient uptake. Selectivity: Certain mineral elements are taken up preferentiall
Define Impediments to infuse biology - Lack of trained people? At present, biologists as a rule have not been trained sufficiently in quantitative approaches. A heavy dose of m
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What characteristics might a breeder select for in (i) a cereal crop, (ii) a farm animal? (i) In a cereal variety, a breeder might select for high yield; disease-, frost- or dr
Categorisation of Major Brain Functions As a framework, the major brain functions typically divided into modalities and domains. The major modalities are motor function and th
Physical map is the map of locations of the identifiable landmarks on DNA (for example restriction of the enzyme cutting sites, genes), regardless of their inheritance. Distance i
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