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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.
Altitudinal Variations We know that temperature decreases with increasing altitude. This is mainly due to convection currents in the troposphere - the lowermost (and most dense
Define the Enzyme deficiency or defects? A food sensitivity or intolerance can occur when the body has difficulty in digesting a particular food and therefore reacts against it
Of the cell types observed (Paramecium, Euglena, Yeast, Elodea, cheek cells), would any cell "verify" the cell theory? Explain your answer.
Alanine cycle Alanine Cycle : In the alanine cycle the pyruvate formed from glycolysis in the muscle is converted to alanine by transamination reaction. Alanine is rele
what is meant by "pelagic"?
examples of pyramid of energy
Explain the Appearance of the Pupil The pupil should appear round and regular. The normal diameter is 2-4 mm. On stimulation by light, the pupil constricts, so as to redu
What are the cells that produce the myelin sheath? Of which substance is the myelin sheath formed? In the central nervous system (CNS) the myelin sheath is made by apposition o
Ethylene production - Responses to Infection Ethylene is also induced in response to infection. It is also known to be produced under other stress conditions like wounding
What is condition for the Mendel's second law to be valid? The Mendel's second law is only valid for genes located in various chromosomes. For genes situated in the similar chr
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