Physical competition: the competition for survival of living things; natural selection: natural selection.
Organisms compete with each other, and those who can adapt survive. Originally referring to the natural law of survival of the fittest in nature, it was later also used in the development of human society. The laws that a species must abide by in a new environment. Darwin's "Evolution" once proposed that only organisms that continue to evolve and adapt to their own living environment will not be eliminated.
Extended information
Darwin systematically expounded his theory of evolution in his book "The Origin of Species" published in 1859. Darwin himself called "The Origin of Species" "a long argument", which argued two issues:
First, species are changeable and organisms evolve. At that time, most biologists who read "The Origin of Species" quickly accepted this fact, and the theory of evolution has since replaced creationism as the cornerstone of biological research. Even then, the debate over whether organisms evolved was conducted primarily among biologists and Christian preachers, rather than within the biological community.
Second, natural selection is the driving force of biological evolution. All living things have a tendency to reproduce excessively, but living space and food are limited, and living things must "struggle for survival." Variations exist among individuals in the same population. Those individuals with favorable mutations that can adapt to the environment will survive and reproduce, while those without favorable mutations will be eliminated.
Baidu Encyclopedia-Survival of the fittest by natural selection