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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.
economic importance
Q. What are age pyramids? Age pyramids are the graphical representations in form of superposed rectangles each representing the number of individuals included in age ranges int
Q. What is the structure through which the neural impulse is transmitted from one cell to another? What are its parts? The structure through which the neural impulse passes fro
Define Natural Adulteration - Types of Adulteration? These are the chemicals, organic compounds or radicals which are naturally present in the food and are harmful to the healt
Define the Calcium Toxicity? Elevated blood calcium can occur in association with high parathyroid hormone, hyper- or hypothyroid conditions, bone metastasis, vitamin D toxicit
Q. Why are lysosomes known as "the cleaners" of the cell waste? Lysosomes carry out heterophagic and autophagic digestion autophagic digestion by digesting residual substances
Explain about Skeletal muscle These are attached to the bones by tendons, which help in the movement of the part of the skeleton. These muscles are controlled by our conscious
Proteolytic enzymes They catalyze the hydrolysis of peptide bonds in other proteins. In order to prevent them doing generalized damage to all cellular proteins, they are often
Define Requirements of Protein during Surgery? Negative nitrogen balance is the most common nutritional deficiency related to surgery. Reserves of protein in the tissues and pl
Most of the surface water originates directly from precipitation in the form of rainfall or snow. Ground water from springs also contributes to the flow of most of the streams. The
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