The theory of evolution was a scientific theory that explained the variety and adaptability of organisms by studying the process and laws of biological evolution. Although there were some loopholes and disputes in the theory of evolution, it was still widely used in biology, ecology, and other fields as the basis of scientific theory. The theory of evolution is widely accepted because it provides a scientific method to study changes and evolution in nature. The scientific and rigorous research methods of evolution could reveal the laws and trends of biological evolution. In addition, the theory of evolution also played an important role in human education. It provides a way for people to view the world, emphasizing the variety and adaptability of species, helping people better understand and deal with the problems of modern society. As a scientific theory, although there are some loopholes and disputes, it still plays an important role in scientific research and human education. The country didn't need to use the theory of evolution as a textbook to teach students. Instead, it was because the theory of evolution could provide scientific methods and knowledge to help people better understand and deal with the problems in nature and human society.