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In the previous section we discussed the concept of species in detail and concluded that the concept of biological species and Mayr's definition of species have a wide acceptance among biologists. In this section we shall proceed to discuss the mechanisms of speciation or the mode of formation of a species. Mayr's definition of species amply makes it clear that to qualify for the title of the species, the individuals must be reproductively isolated from other groups. This naturally raises a question whether a new species could arise from populations occupying the same territory. In other words, should the populations of parent species live in quite separate territories in the formation of new species? In our earlier discussions. on natural selection, you have learnt that originmof adaptations is a gradual process, This is much more true of speciation. Biologists recognise three different kinds of speciation.
Q. Why can the amphibian circulation be classified as incomplete and double? The amphibian circulation is double because it is composed of pulmonary and systemic circulations r
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a well lablled diagram of a tilapia
Carbon is important constituents of all organic compounds. It forms 49% of dry weight of the organisms. Earth atmosphere contains 0.03% carbon dioxide gas. The c
List three important discoveries that resulted from the Human Genome Project. Answers should contain three of the following: Only about 2 percent of the human genome encodes p
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State the Testing of Ketones in Urine Ketones are also known as ketone bodies. Ketone bodies are catabolic products of free fatty acids and three ketone bodies that can be dete
What are the characteristics of cardiac muscle that allow it to be highly resistant to fatifue?
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