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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.
MOUT H - It is as transverse slit. It is pseudo type i.e. not open directly into alimentary canal. Mouth is covered by upper & lower movable lips. Movement is due to arb
Occupational Lung Diseases The common occupational lung diseases include silicosis due to inhalation of inorganic dust, allergic alveolitis due to inhalation of organic dus
After the virus capsid containing vimentin gets into the nucleus it is broken down and the DNA is released. Whether capsid proteins are broken down into amino acids or remain intac
Q. What is Osmotic Pressure? Ans. Important characteristic of a cell is 'osmosis'. You would recall reading about osmosis in the Applied Physiology Course in Unit 8. I
Ruminate Endosperm - Variants of Endosperm In certain plants the surface of the mature cellular endosperm shows a high degree of irregularity and unevenness, giving a ruminate
Residue is defined medically as the solid contents that have reached the lower intestine. A low residue diet is composed of foods, which are easily digested and readily absorbed, r
KINDS OF GROWTH - 1 . AUXETIC GROWTH - Body grows by enlargement of its cells without increase in number of cells. eg. Nematodes, rotifers, tunicates. Growth of b
Why are agricultural fields often less stable than natural communities in the similar area? Because agricultural fields usually having one species of crop plant, they have low
Solubility and physical properties of protiens Simple proteins Conjugated proteins Derived proteins
what is the basic structure of a virus?
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