Variations- differences we can see in the phenotypes of each individual.
It is possible to count/measure these differences and show them through graphs.
The phenotype depends on the genotype of each individual which is modified according to the environment.
Variation in population is a variation within all these individuals.
The difference in appearance within different species occur because all those individuals have different genotypes and they survive in different environments.
Phenotypic variation in a population or species is due to environmental variation. E.g. the home language you speak.
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