I really don't want to skip a grade

Chapter 230

"Everything that is alive is called a living thing."

Miao Xiaolong touched his cheek with some uncertainty.

He instinctively felt that this question should not be so simple, after all, it was to be discussed in a class.

However, this question was really beyond the scope of what he had memorized in the college entrance examination and this freshman mid-term exam, so he was really confused.

"What do you mean by 'alive'?" Zhang Jiawei asked with his head tilted.

"To be alive is to still breathe, right?" Miao Xiaolong scratched his head and said.

"Well, what this junior brother means is that everything that is still breathing is a living thing? Is that what you mean?" Zhang Jiawei asked Miao Xiaolong to confirm.

Miao Xiaolong nodded helplessly. He always felt that something was wrong with him, but he didn't know what was wrong with him, nor could he accurately define a creature, so he could only do this.

"Please sit down. Who can refute his question?" Zhang Jiawei looked at everyone and asked.

As soon as he finished speaking, Wang Lejing, who was second only to Li Yishu in terms of beauty in the class, raised her hand in biology class. After getting Zhang Jiawei's permission, she said sharply: "Miao Xiaolong, what did you say?" Is it narrow breathing or general breathing?
In the narrow sense of breathing, many frogs, lizards, and insects in hibernation are actually in a frozen state and do not need to breathe, but they are still alive and still living things.

If you refer to breathing in a broad sense, which refers to gas exchange, and a running car also requires constant gas exchange, then do you mean that a car is also a living thing?

Well, some people's appearance is not bad, but their brain capacity is not enough. "

Some people's looks are okay, but their brain capacity is not enough! ! !
After the whole class was silent for a while, the suppressed laughter of chi chi chi suddenly rose one after another!
This is really a quick repayment of June's debt. Miao Xiaolong just commented on Wang Lejing's words in private yesterday, somehow the owner of Wang Lejing heard it, and paid it back to him in front of the whole class today!
Xiao Dong and Li Yishu were also laughing like crazy, but they didn't dare to look back at Miao Xiaolong, and they didn't know how wonderful his face would be now!
Miao Xiaolong himself was ashamed for a while, and suddenly he smiled to himself, and said haha: "I really don't have enough brain capacity, I need to learn more from classmate Wang Lejing in the future, haha."

……

With a big laugh, the atmosphere of the whole class became much more lively.

After Zhang Jiawei also smiled implicitly, he continued to ask the question: "Then what exactly is a creature? Hey, please don't turn over the book or Baidu, otherwise I won't be able to continue this class. That junior sister, you are the one to answer." .”

The girl Zhao Yining was called up, she thought for a while and said, "Anything that can move, breathe, and grow by itself is called a living thing?"

"Please sit down, who can refute this answer?" Zhang Jiawei asked again.

No one raised their hands.

So Xiao Dong was called up.

He is now the most famous among the freshmen, even Zhang Jiawei knew him, so he was called out by Zhang Jiawei even if he didn't raise his hand.

Everyone looked at him. This question really stumped everyone. They really couldn't think of anything that could move, breathe, and grow by itself, but it was not a living thing.

Xiao Dong shook his head and said, "I can't think of one either. If I have to mention one, I can only say it's the lungs. Lungs are biological organs that can move, breathe, and grow by themselves, but they're not biological."

Zhang Jiawei nodded: "It can be regarded as a rebuttal, so how do you define living things?"

Xiao Dong thought for a while, and said with some uncertainty: "A creature with self-metabolism?"

"Please sit down, who can refute his answer?"

Luo Jiang raised his hand, stood up after being allowed, and said, "Virus does not have the ability to metabolize, it just replicates and proliferates itself, but viruses are biological."

Zhang Jiawei nodded: "Very good, then can you define a creature?"

"As long as it can metabolize and reproduce itself, it is called a living thing?" Luo Jiang was also a little uncertain.

"Please sit down, can anyone refute his answer?" Zhang Jiawei asked again.

No one can refute Luo Jiang this time. The succession of the family line has always been a big problem of biology. Coupled with the problem of metabolism, it seems that biology can be completely defined, right?
Of course, if you have to pretend to refute Luo Jiang's words, Xiao Dong can completely refute, because he can capture Zhang Jiawei's thoughts?

But he doesn't want to be so shameless today.

Let Luo Jiang be complacent. Under the detection of the magnetic field, Xiao Dong found that Luo Jiang's eyes were bright and his back was straight.

"Then let me refute this junior. There is a type of virus called retrovirus, such as AIDS virus. They do not proliferate by themselves, but forcefully insert into the DNA of the host cell, and then permanently change the host's DNA. When the host cell divides When copying, they rely on this to proliferate, so this junior's definition of living things is still inaccurate."

Luo Jiang was a little unconvinced, thought for a while and raised his hands and stood up, "Anything that can copy its own genetic information and increase its number is called a living thing. Is this definition acceptable?"

Zhang Jiawei sat him down, and then asked who could refute Luo Jiang's definition.

This time Li Yishu raised his hand and stood up, and said: "Some computer viruses can also continuously copy their own information and increase their number. Computer viruses are not biological, right?"

……

This question really made everyone discuss a class, but in the end they still failed to give an accurate definition.

只能总结出生物的一些特征：1.生物中除了病毒其余都是由细胞组成的；2.绝大部分生物都有新陈代谢作用；3.绝大部分生物都能对外界事物的刺激做出反应——应激性；4.生物都能生长、生殖和发育；5.生物有遗传和变异的特征；6.生物能适应和影响环境。

In the end, Zhang Jiawei concluded: "Actually, what we have summarized cannot be regarded as the definition of living things, but it is actually summarized in this way in books, and it cannot give a more accurate definition of living things.

It can only be said that biological phenomena are too complex.

Perhaps we can simply define that living things are alive and have life, but it is still impossible to define what is considered to be alive and what is considered to be alive.

This is only in terms of the creatures we humans have discovered so far. In the future, we may find some living things, but they do not meet the characteristics we described above. This is also very possible. "

When he said this, a classmate in the class said: "Impossible? If there is something that doesn't meet these characteristics, can't we just deny it as a creature?"

Zhang Jiawei said with a smile: "Of course. For example, ghosts. If there are ghosts in this world, can we call them a kind of dark energy creature? This may be a question worth thinking about."

"Ghosts? Teacher Zhang, do you think there are ghosts in this world?" Another student asked excitedly.

"I don't know if ghosts exist or not, but I think there may be a kind of dark energy creature in this world that we haven't discovered yet, because the human world has developed to this day, and there are too many mysteries that cannot be explained by current science. "

……

In this biology class, the young Huaqing doctoral student Zhang Jiawei made many freshmen of Tongbo Academy fall in love with biology.

Xiao Dong also had some preliminary ideas about Zhang Jiawei, who is short, fair-skinned, and has naturally curly hair.

This person's mind is relatively flexible, and he is good at finding problems from the most common sense.

I don't know how his subject is going.

And if Xiao Dong wants to build a large biomedical device company, he must build a strong scientific research team.

Xiao Dong wanted to start building this scientific research team from Huaqing Park.

It will take eight years to establish a leading large-scale biomedical device company in China. The time left for him by the system bully is even less than that of the national football team.

(End of this chapter)