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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 the logical order in which the concepts of atoms, molecules, cells... up to biosphere are associated? Atoms form molecules that structure cells that form tissues that f
Responses of Plants to Stress You know that certain plant species can grow in severe environmental extremes. For example, plants grow below 0°C in the Himalayas and above 45°C
The mirrows reach or grayling zone This zone has a less steep gradient, than the trout beck. The river here still flows swiftly, though the current is not fast and conditions
What are the main characteristics of the age pyramids of developed countries? In a stabilized human population the age pyramid has a narrower base as the reproduction rate is
Explain Monascus species Most of the reports of food colourants from microbial sources involve Monascus species, particularly Monascus purpureus, followed by Rhodotorula speci
Silver point extended below canal orifice: - This discrepancy between the round silver wire and an irregularly shaped canal provides the clinician with an opportunity to use so
Long Distance Transport Once in the xylem vessels, the transport of the mineral elements from the root to the shoot is driven by the gradient of hydrostatic pressure (root pre
Define Vitamins, Minerals and Phytochemicals requirement for cancer patients? Several vitamins particularly those of the B-group are essential to promote adequate metabolism of
In chemistry and particularly in biochemistry the fatty acid is a carboxylic acid with a long aliphatic tail (chain) that is either saturated / unsaturated. Many obviously occurrin
What are the main components of the human skeleton?
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