Concept

Nothing in Biology Makes Sense Except in the Light of Evolution

"Nothing in Biology Makes Sense Except in the Light of Evolution" is a 1973 essay by the evolutionary biologist Theodosius Dobzhansky, criticising anti-evolution creationism and espousing theistic evolution. The essay was first published in American Biology Teacher in 1973. Dobzhansky first used the title statement, in a slight variation, in a 1964 presidential address to the American Society of Zoologists, "Biology, Molecular and Organismic", to assert the importance of organismic biology in response to the challenge of the rising field of molecular biology. The term "light of evolution"—or sub specie evolutionis—had been used earlier by the Jesuit priest and paleontologist Pierre Teilhard de Chardin and then by the biologist Julian Huxley. Dobzhansky opens with a critique of Shaikh Abdul Aziz bin Baz, the then Grand Mufti of Saudi Arabia, for holding a belief based on scripture that the Sun revolves around the Earth. Dobzhansky asserts that "it is ludicrous to mistake the Bible and the Koran for primers of natural science. They treat of matters even more important: the meaning of man and his relations to God." He then criticizes the early English antievolutionist Philip Henry Gosse – who had proposed that fossils were created in the places where they were found – for blasphemously implying that God is deceitful. As he had said in his earlier presidential address, "If the living world has not arisen from common ancestors by means of an evolutionary process, then the fundamental unity of living things is a hoax and their diversity is a joke." These two themes of the unity of living things and the diversity of life provide central themes for his essay. Addressing the diversity of life on Earth, Dobzhansky asks whether God was joking when he created different species for different environments. This diversity becomes reasonable and understandable, however, if Creation takes place not by the whim of the Creator "but by evolution propelled by natural selection.

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