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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.
Apical Ectodermal Ridge (AER) We have described earlier that the AER persists at the tip until the last phalangeal cartilage begins differentiation. The following experiments
Q. Into which classes is the phylum Annelida divided? The phylum is divided into three classes: hirudineans (e.g., leeches), oligochaetes (for example, earthworms) and polychae
Question 1 A patient is admitted to the hospital with suspected pneumococcal pneumonia. How would you confirm this initial diagnosis? Answer the following questions a) Which is
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Define Tests for the Presence of Exoenzymatic Activity? Microorganisms require various micro- and macro-nutrients for energy production and growth. These are obtained from the
Define the Diet intervention for lactose intolerance? Lactose is present in dairy products such as milk, cheese, yoghurt, ice cream etc. Hidden sources of lactose may include
Define Protection against poisoning - Function of Vitamin E? 1) Protection against poisoning: It protects liver from injury due to carbon tetra chloride poisoning. 2) Pr
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