What are the advantages of grouping material?
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Grouping helps in gaining systematic knowledge of things. It also gives a general idea about all members of a group and the differences between members of different groups. It is convenient to work with all members of a group knowing their propertie
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Variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation). Variation may be shown in physical appearance, metabolism, fertility, mode of reproduction, behaviour, learning and mental ability, and other obvious or measurable characters.
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