I want to know the answer to the following question:
When did Darwin's concept of evolution become widely believed and central to the modern theory of evolution?
All the background I'm provided with is that "With the development of the modern evolutionary synthesis in the 1930s and 1940s, Darwin's concept of evolutionary adaptation through natural selection became central to modern evolutionary theory, and it has now become the unifying concept of the life sciences.". Is that enough to answer the question?