Karl Kessler
Baltic German zoologist / From Wikipedia, the free encyclopedia
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Karl Fedorovich Kessler (19 November 1815 ā 3 March 1881) was a Baltic German zoologist who worked as a professor of biology at Saint Petersburg Imperial University. Among his contributions was the idea that evolution at an infraspecific level involved mutual aid and that Charles Darwin had placed too much emphasis on competition which he accepted as occurring at the interspecies level.