 However, both Darwin and Alfred Russel Wallace, the co-founders of the theory, and all subsequent biologists depend primarily on observations of living organisms; Darwin concentrated largely on the breeding of domesticated animals whereas Wallace started from the biogeographical distribution of species in the Amazon and Malay Archipelago.In the early twentieth century, population genetics had centre stage, and more recently DNA has become the main focus of observation and experimentation.Philosophers of science argue that we do not know mind-independent empirical truths with absolute certainty