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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.
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Eyes Check for conjuctivitis, epicanthal folds, and observe the inner canthus of both eyes. Look for squint, nystagmus, trauma, lacrimal duct obstruction, corneal opacity, c
Evolution of Metazoa The sponges, coming under phylum Porifera are the closest to Protista, and can perhaps be regarded even as a colony of protists rather than being multicel
Isomerization of citrate Isomerization of citrate: In this step, citrate is isomerized to isocitrate by aconitase which has iron-sulphur centre as its prosthetic grou
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Explain Resistance to Infection in Nutritional Care? Amino acids help to build the body's defence mechanisms like antibodies, blood cells, hormones and enzymes so as to prevent
Explain the term Mutations? Mutations are changes in the genetic structure of an organism that occur at random or are the results of environmental causes. The majority of new m
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Ornithophily - Cross-pollination In tropical areas, the birds dominate over insects as important pollinators. The most common among them are humming-birds, sun-birds and honey
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