Natural selection: it can be understood as the competition between creatures, the choice of survival that can adapt to life and the survival of the fittest. That is, the law of the jungle now is the slogan of modern biology.

Use into waste and return: refers to the organ of the body will become developed if it is used frequently, and will gradually deteriorate if it is not used frequently. Just like the brain, the more you think, the more you use, the more flexible you are; The lazier you are, the more your brain will be like a rusty chain, making it difficult to function normally.

2. For living things, the two principles of survival are different.

It is a miracle that natural selection creatures can behave strangely in different difficult environments. In extinction, it is fully proved that only adaptable creatures can survive.

Lamarck's evolution theory of "use in and waste out" means that biological organs will become developed if they are used frequently, and will gradually degenerate if they are not used frequently. Just like the brain, the more you think, the more you use, the more flexible you are; The lazier you are, the more your brain will be like a rusty chain, making it difficult to function normally.

3. Their views are different.

Lamarck put forward two rules: one is to use it and waste it; One is acquired inheritance. It is considered that both of them are the causes of variation and the process of adaptation. He proposed that species can be changed, and the stability of species has only relative significance. The reason of biological evolution is the direct influence of environmental conditions on biological organism.

It is believed that under the direct influence of the new environment, the habits of living things have changed, some commonly used organs have grown, and those that are not commonly used have gradually degenerated.

Natural selection is an instinct to adapt to the environment. It is only an expression of the original potential, not a new one. In this way, natural selection in the real world only eliminates mutated organisms, or uses unexpressed potential to preserve the remaining species in different environments.

Extended data:

Limitations of Darwin's view:

He didn't realize such a point-gene mutation. In nature, not only the environment is choosing species, but also the species itself is constantly changing. When the environment changes and the mainstream individuals in the organism are not suitable for the requirements of the environment, they will choose mutant individuals.

When environmental changes are no longer suitable for the survival of ordinary apes, among the many mutated individuals, those who adapt to the environment are retained and those who do not adapt are eliminated. Sometimes, the speed of gene mutation in species is far beyond people's imagination. Once in new york, a long-haired mouse was found in a frozen food bank, but there was no such species around.

It shows that mice have been foraging at low temperature for a long time in order to eat the food in the food bank, and the environment has chosen individuals with mutant cold resistance genes. Darwin believed that the evolution of species was gradual, but failed to explain the internal reasons of species change.

Examples of "natural selection" and "use in and waste out":

Using giraffes as an analogy, giraffes have short ancestors. Because I want to eat tall leaves, I try my best to "grow" my neck. As a result, their necks grew bigger and bigger, and they were passed on to the next generation. Deep-sea fish, because they can't see light, their eyes degenerate and are passed on to the next generation. This theory has a fatal flaw. Although their bodies have changed, their genes have not changed. No matter how tall they grow, they will not be passed on to the next generation.

From Darwin's point of view, giraffes survive because there are recessive and dominant genes, some of which are high and some are short, and the genes can be passed on to the next generation, and they are getting higher and higher.

A group of giraffes want to eat leaves. At first, every giraffe can eat leaves. But later, the shorter leaves were eaten up. From the point of view of natural selection, giraffes with long necks survived because they could eat leaves. This is what Darwin called survival of the fittest.