“Our basic understanding of evolutionary theory (how evolution works) in the early twenty-first century may be summed up as follows:   1. Mutation introduces genetic variation, which may introduce phenotypic variation. 2. Developmental processes can introduce broader phenotypic variation, which may be heritable. 3. Gene flow and genetic drift mix genetic variation (and potentially its phenotypic correlates) without regard to the function of those genes or traits. 4. Natural selection shapes genotypic and phenotypic variation in response to specific constraints and pressures in the environment. 5. At any given time one or more of the processes above can be affecting a population. 6. Dynamic organism-environment interaction can result in niche construction, changing pressures of natural selection and resulting in ecological inheritance. 7. Cultural patterns and contexts can impact gene flow and the pressures of natural selection, which in turn can affect genetic evolution (gene-culture coevolution). 8. Multiple inheritance systems (genetic, epigenetic, behavioral, and symbolic) can all provide information and contexts that enable populations to change over time or avoid certain changes.”