The long years have been carried by unpredictable storms and thunders, constantly urging the process of evolution. About 6 million years ago, the first upright walking apes finally appeared. For upright walking, genetic mutations are only biological causes, and what we are really looking for is the evolutionary cause, or the ultimate cause—and only by finding the ultimate cause of evolution can we truly understand what it means to evolve humans!

Looking at the snake corpses scattered on the snow in front of him, as well as the huge corpse of the most eye-catching golden python among them, Chi Hua suddenly felt a deep and inexplicable sadness, this huge snake did not even attack everyone once, but it still did not escape the fate of being slaughtered.

The reason for this human-snake fight is so ridiculous when you think about it seriously, just because of the chance encounter between the two groups on their respective foraging roads, but nature is so cruel!

Everyone gathered around Shi Lei, and Shi Lei, whose face was black and purple, had long since lost his breath. Maybe since the end of the world, I have seen too much death, except for Lu Wei's red and swollen eyes, there is no sadness on the faces of the others, and the completely frozen land can't even bury it, and in the end, Yan Jie can only use a few fireballs to hastily cremate Shi Lei's body.

The repeated struggles made everyone feel exhausted. Perhaps only Li Xiaofei was an exception, taking a knife around in the middle of the field and teasing the corpse of the snake.

"Xiaofei, what are you doing?" Qin Yurou couldn't help but ask curiously.

"Which one to eat for a while!" Li Xiaofei replied without raising his head.

"These snakes can't be eaten." Chi Hua said coldly.

"Ah, why can't you eat it?" Li Xiaofei stood up suddenly, looked at Chi Hua with blank eyes, and waited anxiously for an answer.

"These snakes are not evolutionary, but directly exposed to strong radiation, you are not afraid of death, you can eat and see."

Li Xiaofei's head drooped suddenly, and he no longer had the excitement he had just now.

Chi Hua used a knife to cut open several snake heads one after another, and then shook his head lightly at Luo Zhigang.

Fearing that they would encounter mutated animals again, they chose to return to the sewers to rest first and continue exploring the next day.

At the exit of the sewers, Huang Wenming's body was gone, leaving only a large pool of blood on the ground and fragments of broken clothes, reminding people of what had happened here.

A few fires were lit, and everyone sat in groups, except for the crackling sound of the firewood burning, and the silence in the sewer was a little depressing.

Chi Hua coughed, first breaking the oppressive atmosphere, "Mr. Li, did you encounter so many mutant animals last time?" ”

"If we had been in this situation last time, how could we have come back alive?" Li Dong paused for a moment, and then said: "The second time we came, we only encountered hundreds of mutant giant rats, encountered a wolf that was extremely fast, and saw a group of baboons from afar, all of which were freed from losing a few lives, and finally returned in vain because we couldn't open the door of the cold storage." ”

"How far are we from our destination?"

"It's less than 5 kilometers away, but we're in the middle of the zoo right now, so I don't know what else we'll encounter on this stretch of sewer!"

"If we finally open the cold storage door, how are you going to get the food back?" Chi Hua turned to look at Song Yu.

Song Yu brushed the hair on his ears and smiled bitterly, "Use your life to fill it!" Most of the people who choose to stay are waiting to die, they just choose how to die, and the food that one person transports back can save dozens of people. Some people will definitely not survive this winter, and they will have to make one last contribution to the camp. Song Yu's flat tone revealed deep sadness.

The heads of several other camps also nodded secretly, obviously holding the same thoughts as Song Yu.

Chi Hua stared at the fire for a long time and did not speak. Chi Hua pondered for a long time, then suddenly raised his head and asked Yang Hongquan, "Elder Yang, you are engaged in medical research, do you think radiation can really promote biological evolution?" ”

Everyone present was attracted by Chi Hua's question, either pricked up their ears, or sat down directly.

Yang Hongquan thought seriously for a long time before he slowly spoke: "Young man, I know what you are thinking. The giant rats we encounter today are mutations caused by radiation, but the group of snakes we encountered later did not have obvious mutations, but an evolved mutant snake appeared. The principle of radiation-facilitated evolution is that radiation promotes genetic mutations, and accidental beneficial mutations give the species some kind of key trait, which in turn makes the species more adaptive. ”

"Some astronomers even believe that human evolution is due to the cosmic ray radiation released by supernova explosions, because there is evidence that supernova explosions occurred 1.7 million to 3.2 million years ago and 6.5 million to 8.7 million years ago respectively affected the earth, coincidentally there happened to be an ancient ape that gained the ability to walk upright about 6 million years ago, and the history of human walking through archaeology is also exactly 3.2 million years. In addition, 2 million years ago, the human brain development gene suddenly accelerated mutations, 70 times faster than other gene mutations, and since then the human brain and the ape brain have parted ways. ”

"It's a bit far." Yang Hongquan smiled, and then continued: "But in practice, the chance of promoting beneficial evolution through radiation is almost zero, because genetic mutations are non-directional, and it is impossible for our current scientific and technological level to control the direction of genetic mutations, and more than 99.99% of living things will die in radiation. ”

Yang Hongquan deliberately paused for a moment to let everyone sort out their thoughts, and then continued: "As an evolutionary, I am also looking for the reason for our own evolution, but it is definitely not caused by nuclear radiation, because there were a large number of evolutionaries before the outbreak of nuclear war in the world, in fact, I personally prefer evolution to be related to unknown viruses. So I don't think it's nuclear radiation that causes evolution, on the contrary, evolution increases the success rate of radiation evolution, because under normal circumstances, there would never be such a large number of rats and snakes that would have survived radiation. ”

Although Yang Hongquan's words did not completely solve the mystery in Chi Hua's heart, Chi Hua still vaguely touched something.

……

The next day. Everyone passed by the place where they were fighting with the snakes again, and there were obviously many fewer corpses of snakes on the ground, and everyone's faces were very solemn.

There was no need to urge, everyone consciously quickened their pace, and Li Dong, who was in the lead, was more cautious than yesterday. The next journey was very smooth, everyone was about to walk out of the gate of the park, and at this time, only half of the broken low wall was left at the gate of the park, and Li Dong suddenly stopped.

I saw a tiger lying on the side of the low wall facing the sun, although lying on its stomach this tiger still looks as strong as a calf, covered in black and yellow patterns, the stripes are slender and clear, there are a few white hair spots on the chest, abdomen and limbs, and the body hair is short and bright. The limbs are stout, the tips of the claws are protruding from the toes, and the tail is thick and long, with black rings, and it is slightly curved and swaying like a steel whip. The most obvious is a pair of upper canines that are clearly visible outside the long mouth, with a length of more than 20 centimeters, sharp as a sword.

Everyone held their breath and didn't dare to move a single step.

The tiger was napping comfortably in the winter sun, and the sudden appearance of humans did not pay any attention to it.

"It's a Bengal tiger, maybe it's a genetic mutation that has some characteristics of a saber-toothed tiger." Yang Hongquan said in a low voice.

Li Xiaofei stabbed Chi Hua and asked in a low voice, "Can you eat this?" ”

"I can't guarantee if I can eat it, but the tiger bone and this tiger skin are good things! Don't rob me! Chi Hua said a word, then picked up his knife and shield and slowly walked towards the tiger.

"What a man! I'm convinced! Liu Zongxian gave a thumbs up to Qi Hao and Luo Zhigang.

As Chi Hua slowly approached, the tiger who was squinting and napping suddenly glanced at Chi Hua. It is this seemingly casual glance, but it exudes a fierce and awe-inspiring aura, revealing a domineering aura that overlooks everything, as if as long as it roars, the whole heaven and earth will spontaneously tremble, and all living beings will bow their heads to the subordinate.

Chi Hua was so excited by the tiger that he couldn't help but pause, and then stomped his feet and pounced on the tiger.

The tiger finally stood up, and suddenly let out a beast roar, and at the same time pounced on Chi Hua, who was running towards him, as the king of beasts, it could not tolerate the provocation of any creature.

The moment he rushed forward, his body was streamlined, his muscles were strong and toned, and he was full of infinite strength.

The tiger's speed instantly increased to its peak, like a yellow lightning bolt hitting Chi Hua, and everyone could no longer see the tiger's movements.

Chi Hua only felt that a yellow shadow rushed towards him, and it was too late to dodge, so he could only subconsciously raise the arm holding the shield.

Chi Hua's arm was raised to his chest, and he was knocked out with a bang.

Chi Hua tried to stabilize his body in the air, stopped with a big knife, and forcibly stopped his upside-down flying figure, one leg was half kneeling on the ground, and a mouthful of blood spurted out.

Chi Hua looked up, only to see that the yellow shadow had abandoned himself and rushed straight to Luo Zhigang and the others.

Song Yu raised his hand in the middle of the yellow shadow and shot it, Qin Yurou's wind blade and Yan Jie's fireball followed closely behind and rushed to the shadow in front of him, only to see that the shadow completely violated the principle of mechanics in the air for a moment, and then rushed forward again, this time it was not even 0.01 seconds, but it was this one that made the bullet and the wind blade fall into the air.

Before Song Yu could shoot the second shot, the tiger had already pounced in front of Liu Zongxian, Liu Zongxian swept the air with a horizontal stick, and the tiger had already taken the first step into Liu Zongxian's arms, and immediately threw Liu Zongxian to the ground and stretched out his mouth to bite.

At the critical moment, Liu Zongxian's metallic luster flickered, and the tiger didn't bite when he went down. The tiger pressed Liu Zongxian under his body with one claw, lowered his head and took a second bite.

The moment the tiger lowered its head, Song Yu's second shot rang out in time, and the bullet grazed the back of the tiger's neck, bringing up a strip of flesh.

The tiger roared, slapped Liu Zongxian away with one claw, and rushed straight to Song Yu, the yellow figure was still in the air, and the claw shadow had already poked out, Song Yu was a woman after all, and she was already stupid in the face of the huge figure in front of her.

At the critical moment, Qi Hao next to him pushed Song Yu away, and the tiger grabbed Qi Hao's chest with one claw, grabbing a large piece of flesh and blood on Qi Hao's body.

Luo Zhigang smashed a bright silver plum blossom hammer horizontally at the tiger's head, the tiger did not retreat but turned its head to Luo Zhigang, Luo Zhigang hurriedly raised another hammer to protect his chest, the hammer claws collided, and Luo Zhigang also flew out upside down.

Chi Hua flew in, jumped high, and slashed the tiger's head with the "head-on big splitting blade", the tiger's body quickly turned, his tail flicked, and the steel whip-like tiger tail pulled Chi Hua out horizontally.

The tiger turned around and pumped Chi Hua's kung fu, the cold light flashed in the air, and a flying knife pierced directly into the tiger's waist, and before Li Xiaofei clapped his hands to celebrate, the tiger's body shook and the flying knife fell, only a trace of blood on the tip of the knife.

The tiger turned around and pounced on Li Xiaofei, Li Xiaofei "Mom! With a strange scream, he saw that Lu Wei, who was covered in thorns, was beside him, and hurriedly hid behind Lu Wei.

The tiger didn't care whether it had thorns or not, he raised his claws and slapped it on Lu Wei's body, Lu Wei was so frightened that he shrank and directly formed a thorn ball.

As soon as the tiger went down, Lu Wei was like a deflated ball, and he didn't even have time to scream, and he deflated all of a sudden. The tiger let out a miserable roar at the same time, and the tiger's raised right paw was also bloodied.

An even more piercing scream followed, and the tiger staggered as soon as it shook. Yang Jinfeng subconsciously jumped up and pounced on the tiger, and the sharp claws in his hands went straight into the tiger's eyes.

The tiger was stunned for a moment and then came to his senses, a pair of tiger eyes stared straight at Yang Jinfeng who pounced on him, Yang Jinfeng also noticed that the tiger's eyes suddenly regained clarity, and it was too late to retreat, but fortunately, he gritted his teeth and inserted it into the tiger eyes at a faster speed.

The tiger gently turned its head to dodge Yang Jinfeng's claws, and then bit back at a lightning speed, outsiders looked like Yang Jinfeng's body took the initiative to send it to the tiger's mouth, and the sharp saber teeth penetrated Yang Jinfeng's neck at once.

"Jin Feng!" Yang Hongquan's eyes turned red all of a sudden.

The tiger shook his head and threw Yang Jinfeng's body out, wanting to get up and pounce again, but suddenly he almost fell down again with a mixture of feet, only to see that the tiger's hind legs were wrapped with a spider silk as thick as a little finger, and the other end of the spider silk was wrapped in Li Xiaofei's hand.

The tiger turned around and wanted to pounce on Li Xiaofei, just about to jump into the air, his body was pulled back and fell down by a force, and a long red rope was wrapped around the tiger's right hind leg, and the other end of the long rope extended directly to Jiang Wei's mouth. At this time, Jiang Wei was half-squatting on the ground, his eyes were protruding, his hands were bent and his shoulders were at the same level, his hands were firmly clasped on the ground, his mouth was wide open, and where was the red rope sticking out of his mouth, it was clearly a long tongue.

Li Xiaofei and Jiang Wei both exerted force in opposite directions at the same time, and the tiger was frozen in place for a while.

It only takes a moment of stillness, first Yang Hongquan twisted his body forward like a snake, and after a few twists, he arrived in front of the tiger, a mouth was like a mouthful of colorless liquid squirting out of the tiger's eyes, and Yang Hongquan's spirit withered at the exit of the liquid, and the air was filled with a spicy and pungent smell.

The colorless liquid shot directly into the tiger's face like a stream of water arrows, and immediately there was a snorting sound like burning sulfuric acid, and a pair of eyes were immediately blinded. The tiger threw its head back and let out an earth-shattering roar, and the roar was filled with endless pain.

Before the tiger's roar could stop, a spear with a silver luster fell from the sky with the sound of the wind, and the head of the spear was plunged directly into the tiger's throat from the tiger's mouth.

In the unfinished roar, the proud king of beasts fell to the ground......