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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.
Planes of Cleavage The ova of most of the animal groups (except some specific cases like insects) are spherical or nearly spherical having their own actual centre comparable
virus symmetry
DIFFERENC E BETWEEN SPERMATOGENESIS AND OOGENESIS - S.NO . SPERM A T OGENESIS OOGENESIS 1. 2. 3.
The long term adaptive mechanisms involve myocardial hypertrophy and remodeling which occurs slowly over weeks to months. The capacity of these adaptive mechanisms meant to sust
What is Single S 2 In cyanotic TOF, S, consists entirely of A, as P, is attenuated by a deformed pulmonary valve when there is valvar steuosis and aorta is placed anteriorly re
Haemo Filtration : Ultra filtration during open heart surgery helps in removing excess fluid, especially in renal failure patients. Patients are haemo diluted (haematocrit 18-20)
Explain the Serial Dilution Process - Plate Counts? Dilution factor is the reciprocal of the dilution used. As number of microorganisms in original sample is not known, the ori
Meningocele In this the meninges protrude through the opening in the vertebrae generally in the lower back. The sac contains meninges and cerebrospinal fluid. The sac may
Q. Explain Disorders of the gastrointestinal tract? The diseases and disorders of the gastrointestinal (GI) tract. Have you ever suffered from abnormal symptoms of the gastroin
Fast Response - Biological Responses Some of the fast responses are discussed below: It was found that when mung bean root tips were kept in a specific solution (contain
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