"The amount of resources required for the rhizomes to lay in the ground is very large, but if too much liquid water is obtained on the surface, it will affect the stability of the biosphere, so I propose to obtain hydrogen and oxygen from the ground to produce water as the main source of access."

"Oxygen can be obtained directly from the air, and this planet is extremely rich in oxygen, but we cannot guarantee that hydrogen will be abundant in the formation." x

"Hydrogen can be obtained from outside the planet, and we build PTZ organisms and send transport creatures to gas giants to carry a large amount of hydrogen resources back."

"Approve the plan, but this can only be used as a backup plan for the lack of hydrogen resources in the strata, the colonization of this star system requires a lot of resources, if it is not necessary, try not to go outside the planet to obtain resources."

"Agreed."

After a simple plan for the expansion of the rhizome in the ground, the thick and long taproot is bred, and after reaching 50,000 meters underground, the one-sided vertical layout is spread out, forming an intertwined network structure in the ground.

This is not once or twice, and the Gatherers have considerable experience in this area, which has aided their rapid expansion into the subterranean.

There are multiple combustion chambers in the formation, which will regularly draw oxygen from the surface, and then pour in hydrogen obtained from the formation by rhizomes, and the two are combined and burned, which not only obtains a large amount of heat energy as an energy source, but also obtains a large amount of water resources.

Before they knew it, the gatherers were soon spreading a network of rhizomes all over the planet's floor, and the rhizomes were intertwined, replacing one of the planet's stratigraphies.

The gatherers then began to extend the rhizome vertically, one facing the surface and the other towards the core, and the rhizome was extended vertically in both directions.

In the process of this expansion, something caught the attention of the gatherers, who found some spherical objects in the stratum at a depth of 10,000 meters, that is, about 60,000 meters above the ground.

"What are these things?"

"Like an egg"

"Be confident, change the doubt to the affirmation, this is the egg of some kind of creature."

"If it were an ordinary stone, there would be no such complex small structures inside these spheres, and along the internal veins, the inside of the spheres would obviously be the embryonic fossils of some kind of creature."

These spherical fossils are so small, about the size of a human thumbnail that they are so small that they can remain intact at pressures up to 60,000 meters underground.

"Carbon-copper elements as a base to build bones, interesting biological design, the community has not yet conceived of materials in this area."

"These things have basically confirmed that there were animals at some point on this planet."

"But now these animals are extinct, what is causing their extinction"

The collectors were puzzled, and after the rhizome monitoring network was laid out, they determined that there were no animals on the planet, but the fossils showed that there were animals on the surface, which means that there were extinction events on the planet that led to their extinction.

"I don't know, these fossils don't leave us with more information, and the lack of understanding about them makes it impossible to simply deduce the cause of their death from the chemical composition."

"But it is certain that it should be a large-scale, even global, catastrophe that caused the extinction of animals, and we can try to find the answer in the stratigraphic changes."

The first thing that the gatherers thought of was the destruction of animals by horrific natural disasters such as asteroid impacts and megavolcanic eruptions.

"That's it, the dividing line between animals and plants, and above this level there are only plant fossils, and according to the half-life, the distance from our current point in time is between 100 million and 1.5 billion years."

"There are no noticeable differences between the two strata."

Comparing the upper and lower areas, there are no obvious traces of segmentation, and if it is a global natural disaster, it will inevitably leave traces in the strata, but there are none.

"That's weird"

"The decline in animal fossils is gradual, and perhaps not the result of a large-scale catastrophe, but more like it has been eliminated by natural selection."

A gatherer proposed, but was quickly questioned by his kind.

"Whoever eliminated them is the only plant on the planet" When the same clan questioned, he suddenly reacted, "You don't want to say that it was the plants that eliminated them."

"Is this possible: Plants are inherently less active than animals, so plants can only act as producers of the food chain rather than consumers, and plants on this planet are also less subjective than animals, how can they gain the upper hand in biological competition?"

The gatherer stated his thoughts, "Probably because of the fire." ”

"Sea of Fire"

The oxygen concentration of this planet is terrifyingly high, and the plants are all oily plants, so to speak, they are gasoline in the shape of plants, and it only takes one spark to attract a fire of hundreds of kilometers.

Animals are indeed much stronger than plants in terms of subjective initiative, but no matter how strong animals are, they are not stronger than flames, and the basic units of genes will be denatured and decomposed in a high temperature environment.

Therefore, the large-scale fire burning on the planet will destroy everything, it is useless to hide in the water, the liquid water will be boiled, and the sky is not good, because the heat of the flames is to go up, and if it is not for the super-large scale perspective like the gatherers, the ability to fly alone is far from enough to survive in the sea of fire.

With this in mind, there is a reasonable explanation for the demise of animals.

"Yes, large-scale fires are catastrophic for both animals and plants, and I think it is in the sea of fire that animals are dying out of the frequent oceans of fire."

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