Actually it takes more than one man and one woman for humanity to avoid extinction with a reasonable degree of success: https://en.wikipedia.org/wiki/Minimum_v

Actually it takes more than one man and one woman for humanity to avoid extinction with a reasonable degree of success: https://en.wikipedia.org/wiki/Minimum_viable_population https://en.wikipedia.org/wiki/Minimum_viable_population Of course, that number depends on things like the environment (a favorable environment will mean a smaller number) and the genetics of the "first" generation. I seriously doubt that the number could be as small as two for any species even under the most ideal circumstances.