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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 symptoms in Bone marrow of pernicious anaemia? The nucleated red cells of the marrow are greatly increased. The successive nucleated cell stages in erythropoiesis a
The nerve centres which control the body temperature and the urge for eating recontained in: 1. Hypothalamus 2. Pons 3. Cerebellum 4. Thalamus Hypothalamus is the
Culture Conditions The culture vessels placed in suitable trays or racks, are stored on the shelves in a hygienically maintained culture room, under controlled conditions of l
Protection of Plants against Toxic Substances Plants produce several toxic substances themselves and may also encounter the ones produced by other plants or present in the env
Explain Components of second heart sounds? The first component of S 2 is due to closure of aortic valve (A,). The second component is due to closure of pulmonary valve (P 2 ).
Q. What is the typical conformation of the age pyramids of underdeveloped countries? The age pyramids of the peripheral countries or the underdeveloped countries have character
Q. What are blood stem cells? Stem cells are undifferentiated cells able to differentiate into other kinds of specialized cells. The stem cells of the bone marrow originate
Maintenance and Regulation of Peripheral Circulation Pressure receptors (baroreceptors) located in the wall of the internal carotid arteries and in the arch of aorta, when
Types of Organization Chart: There are two important types of organization chart. a) Vertical i.e., from top to bottom. b) Horizontal i.e., from left to right.
Explain assessment of iron status - Serum Ferritin? Serum Ferritin: This method is indicative of iron stores. As we know, a long term negative iron balance first results in dep
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