Genetic drift and natural selection are described as processes that:

1. It is tempting to treat evolutionary forces one at a time. 2. Natural selection and genetic drift usually occur simultaneously in populations. 3. They are not isolated events. 4. Drift changes allele frequencies randomly with no advantage to the population. 5. Selection acts at the same time on the same gene pool. _Source: OpenStax Biology 2e (CC BY 4.0), Ch 19 'The Evolution of Populations', sections 19.1-19.3_