"Natural selection, survival of the fittest" means: living things 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.
1. Source: From "The Origin of Species" by Darwin, a British biologist and founder of the theory of evolution. The central idea of ??Darwin's theory of evolution is natural selection or natural selection.
It mainly means that living things are constantly mutating and producing new traits. Some mutations are more competitive, while others are less conducive to survival. In this way, among the many mutations, species that are suitable for the environment are retained, and those that are not suitable are eliminated, which is the so-called survival of the fittest.
Extended information:
Introduction to examples of "natural selection and survival of the fittest" in nature:
1. In the 19th century, there was a moth in England. There are two types of moths: white moths and black moths. White moths account for the majority, about 95, and black moths are very rare, only about 5.
Because this moth likes to live on birch trees, and the bark of birch trees is white, so white moths fall On the top, the color of the body blends with the color of the bark. They are both white and difficult to be spotted by natural enemies. However, the black moth is more miserable. The black body falls on the white bark, which is too obvious for natural enemies. They can be seen at a glance, so black moths are particularly easy to eat. Therefore, there are more white moths and fewer black moths.
2. Later, after the industrial revolution began, the number of black moths gradually increased, while the number of white moths decreased.
Because after the Industrial Revolution, many factories appeared in the UK, and the factories burned coal. At that time, there was no awareness of preventing air pollution, so more and more waste gas was emitted into the air. Gradually, The bark of the birch trees is stained black by pollutants.
The living conditions of the black moth are reversed. The black body falls on the black bark, making the natural enemies invisible. The white moth lands on the black bark and looks very conspicuous, making it easy for natural enemies to spot it. In the end, the numbers of white moths and black moths even reversed, with black moths accounting for 95, while white moths only had 5.
Baidu Encyclopedia - Survival of the fittest by natural selection