How Darwin s theory of natural selection explains the evolution of living things

Darwin's theory of natural selection has four main points: overbreeding, the struggle for survival (also called survival competition), heredity and variation, and survival of the fittest.

1. Overbreeding. All kinds of organisms on the earth generally have a strong reproductive ability, and all have a tendency to grow according to geometric ratios. But in fact, for tens of thousands of years, the population of various organisms has remained relatively stable for a certain period of time, which Darwin believes is due to the struggle for survival caused by overbreeding.

2. The struggle for survival. Any kind of creature has to fight for survival in the course of life. Struggles for survival include struggles between organisms and the inorganic environment, struggles within species, such as struggles for food, mates, habitats, etc., and struggles between species.

As a result of the struggle for survival, a large number of organisms die, as a result of which only a small number of individuals survive. But what kind of individual can win and survive in the struggle for survival? Darwin explained it in terms of heredity and variation.

III. Heredity and variation. Darwin believed that all living things have the property of mutating. The root cause of variation is a change in environmental conditions.

Of the various variations produced by living things, some can be inherited and some cannot be inherited. But which variants can be inherited? Darwin explained it in terms of survival of the fittest.

Fourth, survival of the fittest. Darwin believed that in the struggle for survival, individuals with favorable variation are more likely to win and survive in the struggle for survival. On the other hand, individuals with unfavorable mutations are prone to defeat and die in the struggle for survival.

That is to say, all the organisms that survive are adapted to the environment, and the organisms that are eliminated are not adapted to the environment, which is the survival of the fittest. Darwin called the process of survival of the fittest and the elimination of the unfit in the struggle for survival natural selection.

According to Darwin, the process of natural selection is a long-term, slow, continuous process. As the struggle for survival continues, so natural selection is also continuous, and through the selection of the living environment from generation to generation, species variation is directed to accumulate in one direction, so that the traits are gradually different from the original ancestors, and in this way, new species are formed, which leads to the evolution of organisms.

The doctrine of natural selection can be explained scientifically.

The causes of biological evolution and the formation of the DAO of adaptability and diversity of organisms should be the strengths of the theory of natural choice

The theory of natural selection holds that the individual is the basic unit of biological evolution, while the modern theory of biological evolution holds that the population is the unit of biological evolution, which is correct

Due to the limitations of the level of scientific development at that time, the theory of natural selection failed to give a scientific explanation of the nature of heredity and variation

The doctrine of natural selection fails to recognize that population is the basic unit of biological evolution, nor can it give a scientific explanation of the nature of heredity and variation in living things, and how natural selection works on heritable variation

So the answer is: d

Answer: Two important differences between Darwin's theory of natural selection and modern theories of biological evolution are: The units of study are different: the former is based on the individual, and the latter is based on the population.

Explanation of heredity and variation: The former inherits Lamarck's view, and the latter explains it at the level of genes.

Modern theories of biological evolution are based on Darwin's theory of natural selection.

The modern theory of biological evolution is a further development and refinement of Darwin's theory of natural selection.

Darwin's theory of natural selection takes the individual as the basic unit, and the modern theory of biological evolution takes the population as the basic unit of biological evolution.

Darwin's theory of natural selection cannot explain the nature of genetic variation, and modern theories of biological evolution solve this problem.

The main idea of modern biological evolution theory is that population is the basic unit of biological evolution; Mutations and genetic recombinations provide the raw materials for the evolution of organisms; Natural selection determines the direction of biological evolution; Isolation is a necessary condition that leads to the formation of new species.

Scientific Exploration: 4 Crazy Evolutionary Theories, Was Darwin's Theory of Natural Selection Wrong? Listen to the experts!

Darwinian evolution, natural selection, I think is correct, because natural selection is actually a view of our ordinary life, and there is also a choice.

Fully supported. The natural law of the evolution of living things is like this, the survival of the fittest, the elimination of the unfit, this is a strong iron law.

I think Darwin's theory is very reasonable, human beings evolved step by step.

a. The modern theory of biological evolution is the inheritance and development of Darwin's theory of natural selection, and a. is wrong;

b. From the analysis of the above a, b is wrong;

c. Darwin's theory of natural selection is the basis of modern biological evolutionary theory, and it is also the core of modern biological evolutionary theory, c. Correct;

d. Modern biological evolutionary theory holds that population is the unit of biological evolution, while Darwin's theory of natural selection studies the individual, d is wrong

Therefore, c

Darwin's theory of evolution reveals that the law of natural selection is "survival of the fittest, elimination of the unfit" Natural selection is the most core concept in evolutionary biology, and it is also the key factor that leads to the evolution of organisms Darwin pointed out that living things have a strong ability to reproduce, and because the space and food for living organisms are limited, so organisms will fight for survival because of the competition for space and food All living things have the characteristics of mutation, and among the various variations produced by organisms, some can be inherited and some cannot be inherited, some are beneficial to the survival of living things, and some are not good for the survival of living things; In the struggle for survival, individuals with favorable variations are likely to win and survive in the struggle for survival, while individuals with unfavorable variations are prone to defeat and die in the struggle for survival That is to say, all organisms that survive are adapted to the environment, while those that are eliminated are not adapted to the environment, which is the survival of the fittest Darwin called the process of survival of the fittest and the elimination of the unfit in the struggle for survival as natural selection Therefore, the central content of Darwin's theory of evolution is natural selection

So the answer is:

Answer: Analysis: Darwin's theory of natural selection.

The first part of the theory of perception: "A Sentence Q&A" of "Perceiving the New World".

According to Darwin's theory of natural selection, what determines the direction of biological evolution? （

A Survival Competition of Organisms b Directed Selection of Environment C Inheritance of Organisms d Variation of Organisms.

Analysis] Darwin called the process of survival of the fittest and the elimination of the unfit in the struggle for survival as natural selection Darwin believed that the process of natural selection is a long-term, slow, and continuous process Because the struggle for survival is continuous, natural selection is also continuous, and through the selection of the living environment from generation to generation, species variation is directed to accumulate in one direction, so the traits are gradually different from the original ancestors, so that new species are formed Therefore, The direction of biological evolution is determined by the directional selection of the environment, i.e., the survival of the fittest

Answer] B