However, natural selection remained controversial as a mechanism, partly because it was perceived to be too weak to explain the range of observed characteristics of living organisms, and partly because even supporters of evolution balked at its "unguided" and non-progressive nature, a response that has been characterised as the single most significant impediment to the idea's acceptance.
Sakéwanten, seleksi alam kantun dados pikobet pabligbagan sané pinaka mekanisme, santukan kantun kabaos durung tegteg yéning jagi nlatarang lingsehan karakteristik organisme maurip sané kaselehin, miwah atengahnyané sané nukung evolusi kantun durung satinut santukan punika kabaos "nénten terarah" taler nénten progresif, pinaka respons sané dados cecirén penambak paling signifikan ring sané nrima pamineh punika.bagi penerimaan gagasan tersebut.