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The biologicaI species concept claims that species consist of natural populations and that species are real and objective. They are not man-made subjective abstraction. According to this concept, the members of a species are a reproductive community. The species is also an ecological unit. It interacts as a unit with other species with which it shares the resources of the environment. The species is also a gene pool. These aspects of the biological species concept are made clear in the famous definition of the Harvard evolutionist Ernst Mayr. According to Mayr, "Species are groups of interbreeding natural populations that are reproductively isolated from other such groups". The biological species is not only a distinct unit at any given time, but it also has the evolutionary capacity to change continuously over long periods of time, measured in millions of years.
Four Distinct Phases of Demographic Transition Demographic transition takes place in four distinct phases. 1. Re-industrial stage in which harsh living conditions lead to
Q. What are the classes into which the phylum Arthropoda is divided? What are the three major ones and some of their representative species? The three main classes of arthropod
Q. Explain about Food Exchange System? In a diabetic's day to day diet, the calorie intake and the quantity of food consumed should not have wide fluctuations. Also the diet sh
How much salt is in the human body? 50 Kilo human has about 7 tablespoons of salt inside there body.
What is thigmotropism? Thigmotropism is the movement or growth of the plant in response to mechanical stimuli (touch or physical contact), as when a plant grows around a suppor
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Locomotion Continuous formation of new pseudopodia keeps amoeba in constant locomotion .This is called amoeboid movement .It occurs in many other protozoans , in amoebo
Ask question end product of aerobic repiration are
Brefily describe diffusion ? Diffusion : Diffusion is the process in which there is a net movement of particles of a substance from an area of higher concentration to an are
Explain the concepts of brain development Two concepts that are especially critical to understanding brain development in the very young child are: Symbolic representati
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