And there is another point, which is somewhat different from history, that is, after Zhang Jun traveled to the prehistoric world, he entered the independence cabin, which caused many space doors of the independence cabin to be opened, so after this explosion, many alien items protected by space were blasted out by the explosion, and their parts began to spread to all parts of the world with dust.

Because Zhang Jun changed the state of the independent cabin, the historical changes caused by it are not trivial, and its impact is very great, which Zhang Jun may not have imagined, but it has almost changed the entire history of the evolution of the earth, so next, the evolutionary history that Zhang Jun sees is very different from the history books, the destructive explosion that occurred in the independent cabin will completely change the earth's environment and the evolution of animals and plants, which would not have happened.

Because if Zhang Jun did not open the door of the space of the independence cabin, before the explosion of the independence cabin, most of the items in the space would have been automatically destroyed, so that they would have completely failed, and at this time many high-tech items were lost, these super high-tech items from the alien world would make the earth undergo huge unimaginable changes, and Zhang Jun is a witness to this change, he will soon find that an incomparably magical world is coming to him, and a prehistoric world that he has never imagined is about to take shape.

Based on the judgment that this abnormal disaster celestial phenomenon is the precursor of mass extinction, Zhang Jun immediately led the dragon group into the underground dragon's den, and then he just sealed the entrance with a large stone, did not activate the mechanism, and completely closed the entrance, he still has to wait for the results of the observation in the next few days.

The dragon's nest is very spacious, equivalent to a huge cellar, with a height of about ten meters, enough to accommodate more than a hundred allosaurus, after the dragons enter the underground dragon's nest, they can only rely on Zhang Jun's luminous rod to illuminate, they gather in the center of the inside, discussing what happened above, with different looks, most of them with a little trepidation and surprise.

Soon, there was a loud sound of hooves and feet on the ground, and many animals let out a whistling sound, passing near the dragon's den, and they ran quickly and panickedly, because the dust was about to catch up with their butts, and if they didn't walk quickly, it would be too late, and a large number of animals ran out of the area in the next few days.

The effects of dust began to be felt in the north, because the sun had lost its full exposure in the past two months, and the temperature in the northern hemisphere plummeted, and the daytime temperature had plummeted from more than 20 degrees Celsius to more than minus 50 degrees, which was a very terrifying number, which was a fatal blow to large land animals, because they could not survive three days in such low temperatures.

Only those small animals, who like to live in burrows or caves, enjoy infinite benefits at this time, because their burrows are very warm, and the burrows are not deep enough, and they have begun to be busy deepening their burrows to ensure that the temperature is suitable underground.

It turns out that some small animals, including the ancestors of mammals, and some aquatic animals that have hidden deep in the water, have survived the mass extinction, including crocodiles, snakes, lizards, and some birds.

Three days after entering the dragon's den, Zhang Jun heard the sound of an Allosaurus, which sounded above the dragon's nest, he was underground, but he couldn't hear it clearly, thinking that it must be an Allosaurus running from other areas, so he ignored it.

Time passed for another half a month, when Zhang Jun ordered the dragon group to move away from the big stone block on the entrance stairs, but found that there was an alien dragon lying in the stone cave of the dragon's nest on the ground, there was a large pile of weeds around its body, wrapped it tightly, despite this, its body was almost frozen, because the temperature above was very low, the thermal insulation effect of this pile of weeds did not allow it to resist the biting cold, if another day, it would die.

Zhang Jun took a few Allosaurus over to take a look, and found that it was Red Eye lying in the dragon's nest, it ran back at some point, and when Red Eye saw Zhang Jun, it was immediately like a savior.

Hongyan struggled with his weak body, barely stood up from the ground, and then pleaded with Zhang Jun: "Chief, please take me in, now that the world has changed greatly, I have nowhere to hide, and in two days, I will freeze to death." ”

Zhang Jun didn't plan to take in the red eye, but thinking that this was a special period, since it was at his doorstep, it had been a member of the dragon group before, and he had always respected himself, if he didn't save it, he would be a little unhappy in his heart. So after thinking about it for a while, Zhang Jun decided to leave red eyes.

Red-Eye was naturally very happy, and immediately thanked a few words, and then drilled into the ground from the entrance, the temperature underground was more than ten degrees above zero, so it immediately felt very warm, of course, it also deliberately kept a distance from the other Allosaurus, hid in a no-man's corner, and lay down alone.

In the following days, Zhang Jun returned to the ground several times, and he found that the whole sky here had been dark, there was no sunlight all day, the temperature had dropped to several degrees below zero, and there was a white ice and snow scene everywhere, and many plants had begun to wither, because they were not cold-tolerant, and there was a depression around, and a large number of animal carcasses were placed on the jungle floor, they had already been frozen to death, and a few steps at will could see an animal carcasse.

Zhang Jun still did not enter the dormant state for the sake of safety, and he began to order other Allosaurus to drag the animal carcasses that were close to the ground and let the dragons eat them, so that it lasted for more than half a month, and the scene outside still did not change.

The surrounding animals were all eaten, and the dragon group could not run far away in the low temperature to find the animal carcasses, so finally a week later, Zhang Jun decided to settle down and began to give the dragon group the frozen dormant agent left by the blue scorpion prince.

This potion can adjust the animal's body to a frozen state of suspended animation, and it will suddenly thaw one day two hundred years later, and then activate the frozen animal's body, causing it to instantly produce a heartbeat and come back to life.

This is a magical potion, Zhang Jun has only seen it in science fiction movies before, but this time he has to rely on it to save his life, he has to thank the demon spirit, thank the two great ancestors of the Blue Scorpion Prince, for providing him with such a magical technological product.

After Zhang Jun made the final arrangement, he immediately opened the mechanism, and then only heard a rumbling sound on the ground, and the entrance of the underground dragon's nest was filled with a pile of gravel and dry soil, the underground dragon's nest was more than ten meters deep from the ground, and there were many large stones in the dragon's nest to support the top, which could prevent it from collapsing after a long time.