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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.
Different types of stems (a) Monocots. Secure stems of various plants such as bamboo, sugar cane and corn. Cut every of the stems crosswise with a very sharp knife or razor bl
Braiding technique for SP removal: - Three small size files inserted alongside the silver point. - Files twisted together to engage silver point - Withdraw the f
Which of the following structures in a vertebrate with a four-chambered heart would have blood with the highest oxygen concentration? And why?
Agro-industrial by-products (AIBP) refer to the by-products derived due to processing of the main crop products and allied industries. They are in comparison to crop residues, are
Why doesn't gene therapy cure cystic fibrosis? Although a normal gene is introduced into a patient's surface cells in the lung, these cells are not the ones that require produc
Neurosecretory Systems Almost all groups of multicellular animals have been investigated to find out if neurosecretory cells are present in them. Such investigations have sho
Most of them happen on mucous membrane. Allergens enter the body by the process of inhalation or ingestion.
Anthrax Synonym : Wool sorter’s disease Species affected : Cattle, sheep, goats, pig, horse and majority of the mammals. Fowls are resistant to anthr
Ablation experiment is an experiment designed to produce an animal deficient in one or the few cell types, in order to study cell lineage or the cell function. The logic is to mak
Fluoride Inhibitor Fluoride inhibits enolase enzyme involved in the conversion of 2-phosphoglerate to phosphoenol pyruvate.
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