Because Darwin's contribution to the field of evolution is much greater than Wallace's, Wallace only published one paper, but Darwin has studied it for decades, and both evidence and methods are much more systematic. Of course, it is an indisputable fact that Wallace and Darwin put forward the theory of evolution by natural selection, and Wallace also made special contributions, forcing Darwin to publish his paper in advance. Darwin's theory of evolution was established long ago, but he was afraid of being attacked by religious forces and dared not publish it. He wanted to follow Copernicus' example and publish it before his death. So Wallace sent his paper on evolution to Darwin for advice. Darwin suddenly realized that he would be preempted if he didn't work hard, so he published Wallace's paper with his own, and then published the Origin of Species.

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