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The units of evolution are populations and not individuals because a variation or a mutation in an individual is not sure to last or produce offsprings having the same variation or mutation. The proof that a species has truly evolved is when the variation has allowed the species to survive its environment and produce generations carrying the same variation.

A population is the smallest unit of living organisms, which can go through the process of evolution not the individuals.

What is a population?

A group of individuals of the similar species thriving and interbreeding within a specific area is known as a population. It is the population, which is considered as the units of evolution, not the individuals.

The populations are considered as the units of evolution as evolution is a modification in allele frequencies with time. The alleles of an individual do not modify, however, the frequencies of alleles in a population may modify from one generation to the next.

Thus, populations are the units of evolution.

Find out more information about association between population and evolution here:

https://brainly.com/question/4145459