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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.
Benefits of energy pyramids
Q. What is the cost-benefit relationship regarding sewage treatment as a strategy to fight water pollution? To treat sewage is greatly cheaper for society. The non-treated sewa
Name the reserve food materials in pheophyceae Ans) Reserve food materials in pheophyceae are laminarin and mannitol
Q. For each of the three kinds of life cycles what is the respective ploidy of the individual that represents the adult or lasting form? In the haplontic haplobiontic life cycl
What is meant by Gene Expression? The synthesis of protein under the influence of gene is called Gene Expression. All human cells are derived from a single cell, fertilized egg
Which of the following pairs of functional groups CANNOT react with each other by a dehydration reaction? Select one: a. Carboxyl;Hydroxyl b. Carboxyl;Sulfhydryl c. Pho
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Explain the Irradiation and its Implication The issues are the decreased salivary flow, liability for infection because of the decreased blood supply and the possibility of ost
Classification in terms of reservoir host 1. Anthropozoonoses: Infections transmitted from lower vertebrate to man, e.g., rabies, plague, leptospirosis, etc. 2. Zooanthro
What is the difference between plasma membrane and cell wall? Plasma membrane and cell wall is not the similar thing. Plasma membrane, also called cell membrane, is the outer m
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