Plane Cruise

"Teacher Chen, can you give me a solution?"

"What is confusing?"

"You are a deaf, I have heard it before, I also hear it, tell the truth, in fact, I am also very curious, but I am old, my thinking is stiff, I haven't think about it, you have to think I will fill this pit. "Teacher Chen Mei said.

"Okay, I am a bit shallow. If Mr. Chen wants to listen, then I will talk to Mr. Chen, but this is just my family, Chen Teacher will listen to the story."

"OK, then I have a problem with a question, there is an domestication between animals and plants?"

"Example of the cows I just lifted, in history, it should be a relatively close thing, the domestication of the initial development of agriculture is definitely not such a process, that is, artificial choice is domestication, but domestication is not necessarily It is artificial choice. "

"Well, it's right, that is, domestication may be aimed at the beginning, Mr. Chen will give the students to have a problem between animals and plants. It is to let students think about it. From the world of animals and plants from no human intervene. "Chen Mei said.

"Yes, from the domestication of the wild world, if there is domestication, you can prove that the start of domestication is no doubt, there is no plan, no purpose." Chen Han nodded.

"Take the mutual domestication of fruit trees and animals as an example, the animals are very smart, when choosing fruit, of course, is a big uncomfortable, picking red, green." Chen said:

"Because the fruit trees have this character, it is definitely a big better than a small good, and the red is delicious than the green. This truth is definitely understanding in a long time, and this is also the fruit tree church, The fruit tree is generated their vision and taste. Animals have eaten fruits to pass the fruit core to the distance, helping the fruit trees in the future, but in this process, animals have actually domesticated fruit trees. "

"Well, this is really training, eat big don't eat small, eat red, don't eat green, this caused the fruit tree of the big fruit to get better, small, less good Frequently. Because the small animal does not eat, do not help it spread, can only fall under the feet of this plant, to compete for the nutrition of the land, and the big fruit has got a better development in the distance. "Chen Teacher Mei said.

"Yes, this means, and the animals also domesticated the fruit of the plant, so that plants must be bright when they mature."

"Is there some mature when it is not bright? At the beginning, there may be, but the animals don't eat it, and they will not help these, although the green may also spread, so such a fruit is not very good, Over time, in the screening of animals, the fruit trees must be bright when the fruit is mature. "

"This is indeed aim." Chen Mei teacher nodded: "It's really not to say, this kind of thing really didn't expect, you reminded this, it is true, it is very simple, that is, there is no series. "

"Is there anything like this before you said?"

"Almost, in fact, the production of agriculture is the result of mutual training." Chen Han said that when Chen Han was in the first class, many people had a cognition of the origin of agriculture. Many people think Agriculture is created, which is obviously wrong.

The first wrong cognition is that the human beings in the pre-agricultural age is unimpeded. Under the persecution of life, the ancestors invented agriculture.

This is also a typical purpose, because life is bitter, so it is obvious that this is wrong, because through Darwin's evolutionary theory, you can know that each historic species will be adapted in your specific environment.

If you always eat it, this species have been eliminated, and since it has always survived, there is a way to make a living.

The second error cognition is that human beings have entered the agricultural civilization under the pressure of the crisis. This statement has been very popular. The scholars call "stress", "crisis", obviously wrong.

Because the crisis can't call for agriculture, the only way used in the face of the survival crisis is to reduce members, there is no way, that is, species extinction.

As for the agriculture, it is obvious that this is impossible, don't say too much, I can't come on a single time, is the agricultural civilization is something called?

It is obviously impossible to have a god farm, then a grain, stone sickle, hoe, plow, stone mill, various seasons, storage methods, these are long technology accumulation, thousands of years or even thousands of years A complete agriculture system, if it is true to cope with a big crisis, the agriculture has not yet come out, and human beings are finished.

"That is to say, in fact, 'mutual training', domestication this statement is right, at least you think it is right." Chen Mei chronograph.

"I really agree with this statement." Chen Han nodded.

"So what is the relationship between agriculture and settlement? Prior to agriculture, human beings are mainly hunting collection. That must be similar to the life of nomads. After the agriculture, there is a settlement, that is, settled in agriculture, or agriculture Settlement? "

"Your question is like a chicken or eggs first."

"That is to have a chicken or eggs first?"

Chen Kom smiled and said: "If you think this thing in the dimension of time, it is actually worth mentioning. Agricultural civilization has to be set, and there is less than 10,000 years. Why do you have to have a backward and agriculture? Why can't you happen at the same time, it is meaningless to entangle this problem itself. "

"Well, too."

"It is better to think about this problem, it is better to think about how the settlement occurs, and how the agriculture originated."

"Teacher Chen, you are really good at digging, you just answered my two questions, I took my two big pit." Mr. Chen Mei smiled.

Chen Mark touched his nose and said it was.

"Teacher Chen, you can't dig the pit, I will solve these two questions."

"Forget it, Mr. Chen, you didn't ask." Chen Misfort smiled.

"But you asked."

"Teacher Chen, you still go back and ask your son, let him think about thinking, you can exercise your brain."

"That line, these two questions are temporarily released, now Chen teacher, you and I explain, since the wolf can't be domesticated, how did the dog come?"