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His contributions are discovery of natural selection, pioneering work on biography, wallace line and wallace effect.
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Alfred russel wallace co-discoverer of natural selection,died on the morning of november 7,1913 at 90 years of age.it was the end of a remarkable career that was intimately connected with evolution on the one hand and boldly emblematic of a vocal dissent against materialistic scientism on the other.weismann was one of the scientist to accurately describe the intricacies of cell division and the role of chromosome based upon the work of Walther Flemming[1843-1905],Theoder Boveri[1862-1975],and others.it was weismann who suggested "Weismann Barrier" which put an end to authoritative end to lamarckian notions of the inheritance of acquired charecters.
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