It all comes down to natural selection, or the process by which species pass on the characteristics that enable them to survive. Natural selection is a mechanism of evolution—not evolution itself.

Discover interesting facts about how evolution works, the different patterns that can emerge from evolution, how quickly ...

Aa Aa Aa Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population ...

Discover the science behind natural selection and evolution. Get the facts on survival of the fittest with ExtremeTech’s comprehensive breakdown.