question: When did Darwin 's concept of evolution become widely believed and central to the modern theory of evolution ?
answer: in the 1930s and 1940s
turker_answer: Darwin 's concept of evolution became widely believed and central to the modern theory of evolution in the 1930s and 1940s .
rule-based: Darwin 's concept of evolution became widely believed and central to the modern theory of evolution in the 1930s and 1940s .