Baptiste and Reiner leave the classroom and come to the end of the hallway, where they can see the view from the window.

As the rainy season ends, the water level in Erasmus will not be replenished, and will gradually decrease in the course of nearly half a month, revealing most of the ground, and the soil that has been soaked in water for a long time will precipitate a large amount of nutrients, which is very fertile enough to support the plants to thrive.

Baptiste glanced at Reiner.

"What are you looking for me?"

"Mr. Baptiste, I found a document in the library of the institute last night."

Reiner said, pulling a stack of papers out of his storage bag.

This is a biological expedition to the Irasmus half-plane, but it is not an extant organism, but a study based on various fossils.

That is, the investigation of organisms that no longer exist.

"What do you want to say?"

Baptiste took the document and flipped through a few pages at random.

"This is a fossil expedition of paleontology, and I saw in it an ancient species of the rainforest falcon, which is not much different from a regular falcon, at least not in terms of the structure of the fossil reaction."

Reiner explained that there are some traces of excavations, including the remains of a rainforest falcon's nest, fossilized bones, and fossils from being wrapped in soft soil.

"This is a fossil that dates back more than 1,800 years, and the rainforest falcon in the Irazmus half-plane is no different from the falcon in the outside world, but on the fossil that dates back 1,200 years, many differences can be clearly seen."

He turned the first page, and on the second page, there were several fossils of various shapes.

"According to the investigation, the climate of the Irazmus semiplane was not always like this, and it was a region with four distinct seasons like the main plane until the first high water level occurred in 1,100 years ago, and it can be inferred that the climate of Erasmus changed during this period."

In terms of data, the fossils of rainforest falcons show different morphologies, some wings are larger than those of the general kind, and some claws have been changed, which are closer to swans and ducks, because the fossils cannot reflect the changes in the internal organs of the feathers, so it is not clear whether these rainforest falcons have evolved glands that secrete oil.

"The morphology of these rainforest falcons is very different, and they didn't exactly evolve in one direction, but in the end, among the fossils from 800 years ago, only a type of rainforest falcon with more developed wings remained, which is not much different from the current rainforest falcon."

Baptiste didn't speak, he glanced at the picture on it a few times.

In addition to the rainforest falcon, Reiner also showed fossils of several other animals that had changed from their ancient appearance to varying degrees during the hundreds of years when the climate of the Erasmus hemiplane had changed, and they were all stages of coexistence of multiple forms, not evolving in the same direction, as Baptiste said.

"Mr. Baptiste, I actually have some conjectures, I don't know if you would like to hear it."

Reiner put away the information and said to Baptiste.

"Let's say, different opinions help us think."

Baptiste nodded slightly, but didn't say anything to Reiner's earlier information that was clearly used to refute himself.

"I think that the process of biological evolution is not completed in one or two generations, and this process will last for a long time."

Reiner spoke first, observing Baptiste's expression before speaking.

"The evolution of living things definitely doesn't appear for no reason, there will definitely be reasons, but I think that if you really have to wait for the environment to change, the organisms will adapt to a certain extent, this time is actually too late, just like the Erasmus halfplane, whose climate from the original four seasons to the current rainy season and dry season are staggered, the process is only one or two years."

Fossils of trees from the past can be found beneath Erasmus's beneath the ground, and it is easy to pinpoint the timing of Erasmus's climate change, and it can be seen that the climate change in this halfplane was completed almost in five years, and in this isolated halfplane, Reiner guessed that there must have been a human element in it.

"Therefore, I believe that the change of biological traits precedes the change of the environment, according to the genetic theory, the blood factor is the main factor that determines the trait, and the blood factor is not completely stable, it is possible to mutate, and the mutated blood factor will inevitably cause the change of external traits, therefore, in my guess, the first step in evolution is the mutation of the blood factor."

Reiner said as he noticed the expression on Baptiste's face, but unfortunately, Baptiste did not have obvious emotional fluctuations.

"This kind of mutation is not accidental, but common, continuous, and biological evolution is not based on the individual, but on the population, in fact, the mutation occurs all the time, but some are so small that they cannot be observed, but a sufficient number will cause a qualitative change, which is the quantitative change causing the qualitative change."

After taking two steps, Reiner looked out the window, at the colorful world.

"The accumulation of mutations eventually affects the traits of organisms, and it is conceivable that at some point, the rainforest falcon took on many different forms, ranging from the type with strong wings and flying higher in the sky, to the species that developed webbing and preying on fish that swam in the water, and these different tendencies of the rainforest falcon lived together in this half-plane and divided into different populations."

Reiner's account seems to paint a picture of different birds soaring in the sky and Erasmus half-plane in harmony, but no one knows that it will not be long before something drastic changes will take place here.

"Then there was a change in the environment, the climate of the Erasmus halfplane changed abruptly, at first, most of the rainforest falcons could still survive, but as the seasons became stormy and drought, many types of rainforest falcons began to be unable to adapt to the environment, and eventually died, and these different populations of rainforest falcons began to gradually decrease, and eventually, only one type, the ancestors of the rainforest falcons that we see today, survived, and this process, I call natural selection."

Natural selection is not only limited to environmental changes, the invasion of alien species, and even human activities will lead to the extinction of species, selection is like a sieve, the traits suitable for the environment are preserved, and the unsuitable ones are screened out.

"Of course, these surviving falcons cannot be called rainforest falcons, if they want to continue to adapt to the environment of the Erasmus halfplane for the next hundreds of years, they still need an important step, that is, to maintain the stability of the blood factor, animals are not like humans, they can control the reproductive process independently, if they are not restrained, then the remaining traits can be easily diluted and cannot form new species."

Reiner thought of what the pure-bloods were doing, and in fact, in a way, they were indeed maintaining the purity of their own bloodline.

"Therefore, there will be isolation between the new species and the old species, whether it is geographical isolation or reproductive isolation that cannot produce offspring, and it is only when the falcon of the Erasmus halfplane and other falcons cannot produce the next generation, this species can be regarded as truly evolving into a new species, the rainforest falcon."