Li Xuanzhen took a deep breath, closed her eyes and savored it carefully.

The body of a powerful warrior and the keen perception of the Taoist practitioners quickly came up with the answer.

“The oxygen content reaches 37%!”

Li Xuanzhen opened her eyes and looked solemn.

Under normal circumstances, the oxygen content in the air is about 21%.

If the oxygen content is too high, organisms will be poisoned by oxygen.

The oxygen tolerance threshold of most species on the earth is 35%. If this value exceeds this, oxygen poisoning will inevitably occur.

The oxygen content in this forest has reached 37%!

Strictly speaking, this place is already a biological forbidden area!

It is not only not suitable for human survival, but also for birds, animals and various plants.

You can look down from above, and the whole forest is lush and lush.

As we approach the mountains and forests, the growth of plants is even more crazy!

Looking around, the forest space is occupied by various plants.

Flowers, plants and trees are fighting for survival space frantically, and are unwilling to fall behind.

There is a layer of green moss on the ground, with palm-high grass on the moss. Some grasses can grow to knee-high, or even one person tall.

There are various fungi hidden in the grass, some are brightly red and purple, with bright colors, and they are highly toxic at first glance.

In addition, the mountains and forests are covered with shrubs, thorns, and tall trees that only a few people can embrace.

The largest tree has a diameter of more than 6 meters! The main pole is like a skyscraper, with an umbrella-shaped crown stretching its body to the fullest, covering the sky!

From a distance, a tree is a mountain!

Shocking!

"This should be a legendary special area!"

Li Xuanzhen was energetic and was like a sharp sword unsheathed, extremely sharp!

Even in his previous life, he had never been to a special area, he had just heard of it.

No one knows how these areas came from, they only know that these areas are terrifying.

for example--

There is a city that turns into a swamp, and anything thrown into it for a moment without any bones!

Moreover, that swamp has life and will take the initiative to hunt!

Birds, fighters, mutated creatures, and evolved creatures flying over it will all be dragged into the swamp by it!

For example—

There is a volcanic area abroad, with a surrounding temperature of up to 100,000 degrees!

As for the core temperature, no one knows it!

However, some people speculate that the core temperature is likely to be as high as one million degrees, tens of millions of degrees, or higher!

Li Xuanzhen also heard that even in the depths of Brazil's tropical rainforest, even if the sky is clear, it will lightning and thunder all day long.

In the Russian border area, extreme cold freezes everything, satellite pictures have taken monster ice sculptures that are thousands of meters long!

In the Great Rift Valley of East Africa, the Rift Valley has become unfathomable, and black smoke is everywhere in the Rift Valley, like an abyss that reaches the center of the earth!

...

Too many too many!

These special areas have one thing in common-

There has been an explosion of high-energy spectrum once or multiple times, but no trace of life has been found!

Many people speculate that these places are terrifyingly powerful and intelligent monsters hidden!

【What's the situation?】

[The anchor seems to be very solemn.]

[Teacher Li, what happened?]

[The anchor's expression was wrong after he came to the forest, and he seemed to have discovered something.]

[The forest is so quiet, neither the birds are singing nor the roaring of wild animals.]

【If the sky is dark, it will be a horror movie scene.】

[Is the environmental protection of Bianyang City so good? The forest outside the city is so primitive?]

[I'm dizzy, I'm a doctoral student in plant majors, why don't I recognize many species? Am I so trash?]

[What are you? I asked the teacher, and the teacher looked confused. My teacher is an academician...]

【Blow! Blow hard!】

【b Called?】

[Hello everyone, I am the richest man in the world (when typing on keyboards, I will never be weaker than others in my life!)]

Seeing that Li Xuanzhen's expression was wrong, the audience was curious about what happened.

Li Xuanzhen said in a deep voice: "This forest is strange!

Under normal circumstances, the oxygen content in the air is about 21%.

Low oxygen content, and hypoxia.

High oxygen content can cause oxygen poisoning.

The oxygen content of this forest reaches 37%!

The more I go, the higher the oxygen content!

According to my estimate, the oxygen content in the deep forest is at least more than 40%!

This means that this forest is not suitable for biological survival! Existing species will die on a large scale!

But the forests are lush and denser than before, with more flowers, plants and trees than before, and are taller, bigger and thicker than before.

This only means one thing-

This mountain forest has completed a major biological cleaning without realizing it!

In other words, plants in the mountains and forests evolve collectively to adapt to the environment!

The plants in front of you look familiar, but in fact, they are no longer the species that everyone thinks of!”

Li Xuanzhen was cautious: "In short, this forest is countless times more dangerous than the original forest, and ordinary people will surely die if they break in!

Okay, I want to come forward and find out! I confirm some thought in my heart!”

Li Xuanzhen is very skilled and brave, and goes straight into the depths of the forest.

He practices both martial arts and is also a warrior of the Great Perfection of Qi Nuclear. He is responsible for the "Fifty-Eight Billion God Star Universe" and can fight beyond the level!

Now, the end of the world has not yet arrived, the biological outbreak has not yet begun, and there are very few mutant beasts and evolved creatures in the third stage.

As for the fourth and above stages, it is rare!

These monsters are all hidden in rarely visited places and cannot be hidden beside the city!

Li Xuanzhen's spirit was twisted into one spirit, and his whole body was like a sharp sword unsheathed. Walking along the way, the leaves, vines and branches around him seemed to be shattered by the invisible sword energy, which could not stop him at all.

Li Xuanzhen's advance speed is not fast or slow either.

Logically speaking, the forest is lush and there should be many small animals inside.

But Li Xuanzhen walked for half an hour and didn't even see a hare and pheasant.

After about half an hour, he finally discovered a new life.

This is a group of green ants.

The ant slaps are long and the streamlined body is full of beauty.

They lie on the grass, in the bushes, on the leaves, and on the vines, and they can't be seen without careful observation.

"really!"

Li Xuanzhen's heart sank.

The only advantage of the high oxygen content in the air is insects.

Insects breathe with trachea. In this environment, the exoskeleton will gradually grow bigger, increase in body shape, and grow to a huge size that ordinary people can unimaginably.

The Carboniferous period, about 300 million years ago, had a high oxygen content in the air, and countless giant insects were born.

At that time, insects were the top predators.

That era was called—
To be continued...