4.6 Billion Year Symphony of Evolution

Chapter 20 Desert Mouth

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Leviathan is flying over the river formed by the torrential rain, the desert is so dry, this rainstorm should be rare, but where will the water go?

Lin felt the need to investigate.

The heavy rain in the sky is still continuing, but it is very strange. It seems that it is only raining over the desert, and in the jungle, Lin's two bases can't feel any rain.

Is the twisted tree trunk blocking the water? Not likely, the only possibility is that the cloud only appeared over the desert.

The Leviathan follows the river and flies in the rain. The speed of the water increases as the rain increases, and eventually becomes an unstoppable flood. It smashes the sand dunes, washes away the boulders, and rampages in the desert with an unstoppable force. Running towards the southwest.

The torrential rain continued for two days and nights. After the rain stopped, the Leviathan still followed the river and flew southwestward. Lin suspected that it had reached the center of the desert now. To the shadow of the twisted jungle.

However, Lin saw something more peculiar in the direction of the river.

In the sand in the distance, an incomparably huge cave appeared. Just by visual inspection, Lin could calculate that the diameter of the mouth of the cave was more than 1,000 meters wide. There was a spiral ladder-like structure in the cave, one layer after another. It leads to the depths, and each layer is narrower than the previous one. The entire cave is several hundred meters deep. In the deepest layer, it is only a few dozen meters wide, and the bottom layer is covered with a layer of white Something like a grain of sand.

This is really amazing, how did it come about? Even looking at it from an altitude of thousands of meters, this cave looks huge, like a huge wound in the desert. Maybe it should not be called a cave, but a 'giant pit'.

The giant pit is made of rocks. The stones inside seem to be cracked by the light of the day, and there is no moisture in it. It seems that this location has never rained at all. The rushing river rushed into the giant pit, following the spiral shape inside the pit. The structure of the crater rushed to the bottom of the pit, and the cracked rock crater was immediately irrigated by water. Lin seemed to hear the popping sound of the stones after they were touched by the water.

This seems to be called "thermal expansion and cold contraction", right?

But even such a huge torrent can only fill about 30% of this giant pit, and a turbid lake full of sand and mud appeared in the giant pit.

It's really fun, and there's no reason not to go and see it.

Lin asked Leviathan to slowly lower the height. When approaching the crater, Lin suddenly felt that the surrounding airflow seemed to become strange. It seemed that there was an airflow trying to drag Leviathan into the crater, but the airflow was not very strong. Lin adjusted her flying posture almost instantly and continued to fly into the pit.

On the way to the crater, Lin found that there were many openings about one to two meters in diameter on the spiral staircases around it. It felt strange. Could it be that there are creatures living in it?

Leviathan flew to the lake in the pit, and could not see clearly because the water was too turbid. Lin released a fish-shaped explorer and threw it into the water. It mainly wanted to see what the bottom of the pit was like.

Facing the turbid water full of sand, the visibility was only about ten centimeters even under the light of the lantern. The explorer used smell and hearing tentacles to detect objects. After reaching the bottom of the water, that is, the bottom of the pit, Lin began to carefully observe the bottom of the pit. The composition of the rock, the layer of white sand seen before the water submerged disappeared, was it mixed up by the water?

It is too suspicious that such a huge pit appeared in the desert, and it was not buried by sand and dust. Lin thought that there was a great possibility that some creatures lived here, and would also clean up the sand and dust in the entire pit.

But... is it possible that this pit was dug by creatures? This feeling is unlikely, not to mention the difficulty of digging such a huge hole in the desert, and what is the point of digging here? Waiting and collecting rainwater that is hard to come by? The twisted jungle is in the northeast,

Even if it is walking on the ground, ten days and nights will definitely arrive. There is no need to dig a pit to live here. Even if it is a creature the size of hundreds of mist worms to dig, it is estimated that it will take several years to dig it out. Such a big place.

The more she researched, the more peculiar she felt. It felt that it was necessary to set up a base here to observe the changes here.

Just as Leviathan was preparing the seed of the base, the explorers in the water suddenly felt a wonderful vibration, as if many small creatures suddenly appeared and were swimming.

this is……

A small worm-like creature, about a few millimeters in size, wriggled in front of the explorer's eyeballs and swam slowly past.

worm? Is it the creature that originally stayed at the bottom of the pit?

Then, many worms appeared in the explorer's field of vision. They seemed to appear suddenly, and more and more, even if there was only such a small visibility, the explorer's field of vision was now filled with countless small Worms, Lin felt as if they outnumbered grains of sand in the water.

Where did these things come from? Originally at the bottom of the pit? Or was it washed here by the river in the desert? Well...the first possibility is obviously quite large.

Lin let the explorer swim around the bottom of the water. It found that there were many small round spheres on the ground. The explorer stretched out his tentacles and grabbed a sphere. A small worm emerges from the slit.

These are their eggs. The explorers found countless such eggs on the rocks at the bottom of the water. Could it be that a large worm came here to lay eggs? And then let the eggs wait for the water to melt?

This is really fun, so this pit is made by worms? But it's too hasty to say that, and I don't know how big these worms can grow. Seeing that they are covered in flesh, they don't have the pink appearance of a carapace. They should not be the cubs of monsters like mist worms.

Besides, why do you have to live in a pit instead of going to the jungle? There is no food here, it just happens to be raining.

While Lin was thinking, Leviathan suddenly felt a lot of noise in the air. Lin raised her eyes and saw countless figures flying around the huge crater.

Those are... gigantic dragonflies? What are they here for?

There may be hundreds of dragonflies, and they all flew into the giant pit. They were a little afraid of the Leviathan with a huge wingspan, but they all flew down. Most of them stopped on the surrounding stairs, while some were Flying around the water.

Lin thought that they came here to catch worms to eat, but after watching for a long time, no dragonflies tried to go into the water to catch worms, but made some strange movements.

Some dragonflies start lying on top of the other dragonfly, and the one on top bends its slender tail forward and inserts it on the head of the dragonfly below, while the dragonfly below bends its tail at the same time, inserting it above. Dragonfly's chest.

It turns out that it is reproductive activity.

Most organisms in water prefer to spray cells directly into the water to reproduce, while organisms on land cannot do this, so they are more direct, injecting reproductive cells directly into each other's bodies.

Lin observed a pair of dragonflies. They separated after a while. The one at the top continued to run to find the others that had not been dealt with, while the one at the bottom bent its tail and clicked on the water. click.

It seems that the upper part is male and the lower part is female. The female lays eggs on the water surface. There is almost no difference in the size of male and female dragonflies. On the way to observe the creatures, Lin found that the males are mostly responsible for collecting various items for their offspring. Generally speaking, they will fight with each other and try to become the strongest one to find females. Females generally do not fight, but are responsible for directly producing offspring, so the body shape will vary over time.

Although males prefer to fight, so they are usually stronger, but it is not necessarily the case that males are larger than females. For example, sharks are females larger than males, which may be related to the dangers they will encounter during production. run away, and the females have to face the more terrifying creatures that come to prey on their young, like dungeonfish or something.

This kind of reproduction method is quite fun, and it can ensure that the offspring are the strongest offspring, but there are some problems, such as making the species become disunited and fighting each other among the same species. Lin believes that evolution is based on unity. Yes, after all, only the most united single cells can become multicellular organisms.

Giant-veined dragonflies don't seem to have these problems, so both males and females look exactly the same.

Leviathan unleashed more explorers, who found eggs laid by female dragonflies on the water. These eggs, like worm eggs, melted in water, and a small arthropod that looked like a dragonfly burrowed out of them. , and start hunting small worms nearby.

This is really a clever way of reproduction, but this big pit can't be made by dragonflies. They should only accidentally find worms here and then come to lay eggs.

So, what is going on with this pit?

Lin became more and more interested here.

…………………………………………………………

Thank you ~688 of Soul Seeker~!

Thank you~an~ for the reward~

PS: Reference map of the giant pit: [[[CP|W:210|H:140|A:C|U:/chapters/20137/11/2718601635091726558205000192829.jpg]]]

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