Explain the influence that darwin's idea of natural selection had on the modern theory of evolution.

Well, once, people thought that evolution had a goal, and was not random. That belief was called goal oriented evolution. Darwin's theory of natural selection stated that evolution happened because of how species adapt to their environment. If they cannot adapt, they'll die, which leaves those who can adapt. So now thanks to him, our idea of how the natural world came to be today is much more developed.