Their bulldozer-shaped bodies and strangely hard "armor" on their heads can smash their prey to pieces in an instant.
Its terrifyingly large mouth means it can easily tear a small shark in half!
The main prey of Dengshi fish are cephalopods with hard shell protection, such as ammonites, nautilus, etc., as well as shield turtles with hard armor protection, and even smaller ones, so Deng shii must be Has an exceptionally powerful bite!
therefore.
Next.
Dunn's fish of the placode family will surely become the king of fish to rule the planet!
It also means.
"Devonian... is it coming!".
Chapter 29
The Silurian is the shortest period of the six epochs of the Paleozoic, lasting only a short period of about [-] million years.
Therefore, Roja hardly felt that the times were changing so quickly, and he had ushered in the early Devonian period. At this time, the ecological environment that was destroyed at the end of the Ordovician period had been completely restored and returned to its peak and heyday!
As a period of great changes in the early earth's biological world, the Devonian was also the most prominent and important period of biological evolution in this period.
First of all, vertebrates have entered a period of rapid development, and all kinds of fish have prospered unprecedentedly, and the number and types of jawed and armored fish have increased.
The modern fish bony fish began to develop.
Therefore, the Devonian is often referred to as the "Age of Fish".
The most important primitive reptiles, tetrapods, and quadruped vertebrates evolved from the most important total fins, as if to remind Roja: "The land has been conquered, come and play ashore!"
land!
Roja's eyes suddenly lit up, he has been waiting for plants and the first arthropods to improve the land environment, and now he can finally officially step into this land!
Shallow sea area.
Roja saw a 74 cm trilobite crawling. For the trilobite family, 74 cm can be said to be quite large!
In addition to this, there are many leaf shrimp creatures. This kind of creature looks like a lobster without a body and has poor swimming ability. Like trilobites, it can only crawl on the bottom of the sea to pick up garbage and eat, but it is also their appearance that leads to The status of trilobites is not guaranteed.
soon.
Roja arrived at the large force area of [Land Attack].
To be precise, a group of four-legged fish seemed to be rushing up against the waterfall at this time, rushing towards the muddy shore. Although they did not make any shouts, the pictures of the groups also made Luo. Ya Nao added the following picture.
"Ooooooooooooooooooooooooo!!!"
Dozens of four-legged fish roared and roared at this time, desperately crawling towards the area far away from the shallow water. Due to the frequent drastic changes in the sea area, in order to survive, these four-legged fish had to stagger on the land. Find more suitable waters for them to live in.
And so the amphibian of the future was born!
Of course, there were still no amphibians in the early Devonian period. Even so, they also took shape. Almost all the quadrupedal fish in the offshore areas of the world began to prepare for landing on the ground.
Why do you do this?
Because the sea is occupied by the group of shield fish family and powerful arthropods, it is difficult for these four-legged fish to develop, after all, the combat power is quite different!
But if they land on land, doesn't that mean that land will be their territory in the future?
These smart species can't compete in the ocean, so they will develop in the direction of land. If they succeed, the world in the future will belong to them!
"These guys are very far-sighted!"
Roja looked at the group of four-legged fish who were clumsy and stumbling on the road at this time, and also joined in the fun at this time.
but.
The arrival of Roja instantly made these weak four-legged fish flee in fear.
But when it was discovered that Roja had no intention of attacking them, some individual four-legged fish began to observe secretly, secretly watching this terrifying behemoth swimming from the ocean towards the shore.
"Watch out, little guys!"
Roja has not evolved over the years.
It is now in its fourth-stage form, and when observing the life of a pterodactyl, such as Xiaolan, sharp teeth begin to appear, and nuclear energy accumulates rapidly in the body.
The forelimbs of the amphibious body have also begun to gradually form. Although it is small, at least there are bones and some fins. Roja in this period, as Godzilla, already has a real baby body.
The body is 25 meters long and weighs 500 tons!
During this period, these behemoths were like the strange shrimps of the Cambrian period, possessing a hundred times the size, quality and strength of other creatures!
As for weight, it will change qualitatively with growth.
The early stage is generally relatively light and belongs to the category of normal creatures.
When it becomes the ultimate creature in the later stage, every one meter of height increases by thousands of tons, and for every ten meters of height, it may be a difference of ten thousand tons.
"Roar!!"
At this time, Roja tried to stand up straight, and the height of nearly five meters appeared on the shoal at this time.
Then, under the gaze of a large number of four-legged fishes, it supported the ground with its two hind feet that barely supported its body and its short front feet. At this time, it crawled forward and walked step by step in the direction of the flora on the shore. go.
boom!
boom!
boom!
The huge footprints sank deep into the sand. At this time, the four-legged fish groups widened their fish eyes in shock, as if they saw something incredible in their small heads.
"Gollum la la la la la!!"
The bubbles in the water continued to rise, and they were spit out by a group of four-legged fish, which seemed to be shocked. .
Chapter 30
That's it!
They seem to be enlightened. The original method of climbing onto the land is not by twisting their bodies, but by fin-like four-legged!
And it seems that the "fins" of that huge monster are not the same as theirs, with five sharp and slender spines, and later they began to imitate this way, evolved sharp claws and legs, and at the same time more and more The four-legged fish began to learn Roja's way of landing on the earth.
Because the learning ability of four-legged fish varies greatly, with different depths, some of them are smart and quickly learn how to crawl.
But there are also some who learn crooked, crawling and crawling are not good, swimming is also abolished, and eventually evolved into all kinds of strange reptiles.
However, Roja soon discovered that the first group of four-legged fishes who learned his landings died suddenly.
Those four-legged fish that reached the ground were basically dead.
The reason is because the creatures cannot leave the salt. When these four-legged fish suddenly reach the land from the sea, the salt in the body is out of control, resulting in a problem of osmotic pressure.
What is osmotic pressure?
This is very troublesome to explain. Simply put, the pressure generated when water passes through a semi-permeable membrane from a hypotonic solution into a hypertonic solution is the osmotic pressure.
It also refers to the attraction of solute particles in solution to water.
Plant cells mainly absorb water by osmosis, and their driving force is osmotic pressure.
Therefore, when marine fish enter fresh water, the osmotic pressure in the body will suddenly skyrocket, and if they cannot stabilize the osmotic pressure, they will die.
"Can't stand the pressure?"
Roja was stunned when he saw the death of a large group of four-legged fish that had learned to climb onto the land on their own.
As for why Roja is different from other creatures, this is rooted in the evolution of powerful G cells and his own genes, in other words, "it is off."
then.
This is awkward.
The four-legged fish squatted in the shallow sea at this time and watched Roja walk on the land. After experiencing the death of the first group of pioneers, they resumed their vitality after reproduction efforts and continued to challenge the land!
"Ooooooooooooooooooooooooo!!"
For the descendants of the dead pioneers, the new four-legged fish rushed to the land at this time, but they did not stay for long, but immediately twisted and crawled in the direction of the sea.
that's it.
Continue to land on land, and then immediately slide into the sea in the muddy channel to exercise your "osmotic pressure" control.
This picture is like practicing, they are also cultivating their own abilities!
That is evolution.
at last.
Tens of thousands of years later, when the first four-legged fish that mastered osmotic pressure control and evolved limb-like quadrupeds, they finally climbed this long-lost land.
At this time, ferns and land-covered, four-legged fish landed, which also represented the beginning of a revolutionary ecosystem!
Freshwater fish is also born!
......
In this era of Devonian ferns, insects and amphibians.
Many areas rise from the sea and emerge from the sea to become land. Compared with the Early Paleozoic (Cambrian and Ordovician periods), the paleogeographic appearance has changed a lot.
but.
The four-legged fish were not the first to land on land, because the first to land were arthropods, such as the water scorpions before.
But water scorpions are arthropods and tetrapods are vertebrates!
What does vertebrate stand for?
Representing giant beasts, representing the coming of the age of monsters!
"Fantastic, my compatriots!!"
Roja looked at the four-legged fish whose bones and muscles began to swell, and showed an ecstatic expression at this time.
Because he is the ancestor of the chordate phylum, the creatures of these vertebrate subphylum began to evolve to climb the land, and Roja, the ancestor, also had a very gratifying feeling.
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