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\tVariation can be defined as the difference between the cells, organisms or group of organisms belonging to a particular species by environmental factors (phenotypic variation) or genetic differences (genotypic variations).\tIt is caused by gene mutations due to certain environmental factors and various combinations of genetic material.\xa0\tVariation is important because it causes evolution and is the basis of heredity.\tIt is advantageous to a population as it enables few individuals to adapt to the environment changes thus, enabling the survival of the population.