Wandering Spaceship in Deep Space Chapter 375: Biological extinction crisis

　　 Zhang Yuan carefully observed this so-called tree core. There were some hollow screen tubes in the middle, and the overall density was much lower than that of steel.

　　 Yamamoto said astonishing, "These tree cores are very good materials for the Riley civilization, providing shelter and food... but they are also a great crisis that destroys the entire ecological chain!"

　　 He hung a little piece of wood with a knife and lit it with a lighter.

　　 Suddenly, the whole burning phenomenon produced a faint smoke.

　　 Zhang Yuan covered his nose, smelling a burnt smell of plastic, thinking in his heart.

　　 Everyone smelled this smell.

　　"It's really like plastic."

　　"What is plastic?"

　　 Zhang Yuan explained: “It’s a polymer material highlighted from oil. It’s very cheap. It was once widely used by the earth’s civilization. However, after the oil is exhausted, it is useless and can only be used in large quantities. Renewable materials."

　　 Yamamoto clicked the button again, "Did you smell it? This kind of tree core is a natural polymer material, and its chemical composition is a bit similar to the plastics widely used on the earth, which is very stable. Matter."

　　 shows an image on the screen. It is a human geographer who has found a fossil vein in a plain area: a large organic mine with a reserve of 300 million tons!

　　"Almost all the components of this organic mine are the core of the world tree. Because it has been buried under the ground for a long time, it has become something similar to coal. It is even better than coal and has a higher calorific value."

　　Some creative biologists have already reacted. Why does Professor Ichiro Yamamoto think that this planet is about to have a mass extinction event!

　　 Why?

　　 "Because these tree cores... can't be decomposed by native microorganisms! So they accumulate in large numbers."

　　 Zhang Yuan was a little bit speechless in surprise, and human beings could actually witness... a mass extinction!

　　The so-called "world tree" by the Riley people is undoubtedly a very good species on this planet, providing food and living places for the Riley people.

　　 Because of its strong adaptability to the environment, the "World Tree" is almost everywhere on the planet.

　　 But also because of the "tree core" of the World Tree, the evolution is too advanced, making the native microorganisms completely unable to decompose this highly stable substance.

　　 The large number of organic mineral veins discovered by humans on the plains are in the original forest. Other fibers rotted. Only the core of the tree accumulated and settled underground.

　　Why do you say that this will cause mass extinction?

　　 is a very simple reason, because the carbon cycle of the native planet is destroyed.

　　 The normal situation of aerobic respiration is that consumers inhale oxygen and carbon dioxide, and producers inhale carbon dioxide to produce oxygen, forming a carbon cycle.

　　 But now, a large amount of carbon element has become the core of the tree sinking under the ground, which will cause the concentration of carbon dioxide in the atmosphere to gradually decrease. Plants do not have enough carbon dioxide and die in large numbers, and then animals are also in large numbers. die.

　　 The carbon dioxide concentration of this planet is about five thousandths. After several million years, tens of millions of years, the carbon dioxide may be reduced by %. At this time, it is difficult for plants to reproduce and produce real lethality.

　　 A biologist sitting below asked: "There are substances that cannot be decomposed by native microorganisms? Professor Yamamoto, do you confirm that your scientific research is correct?"

　　 This question was explained by an expert who personally took charge of geographic scientific research: "We have found the active ingredients in the core of the tree in soils all over the world... Although these substances are macromolecular organic matter, they will become some of them due to physical effects. Small fragments, but even these fragments are extremely slow to decompose, and they can exist stably for thousands of years, or even tens of thousands of years. It shows that the decomposers of this planet cannot effectively decompose the core of the World Tree."

　　"How do you say, it’s like plastic. Although small plastic particles are not poisonous, they will not be decomposed when buried under the ground for a long time. The active ingredients in the core of the tree are even more stable than plastic and can exist more. A long time."

　　 Zhang Yuan nodded.

　　 This is the origin of the great crisis.

　　The expert continued: "Ladies and gentlemen. This kind of environmental mutation caused by plant evolution has not never happened on the earth..."

　　"2.4 billion years ago, there was a'great oxygen event' on the earth. The great oxidation event changed the composition of the minerals on the earth and made the emergence of animals possible in the future."

　　"That is, the oxygen content of the entire planet has soared, which is mainly due to the substantial evolution of plants, wood fibers have begun to form, and fungi that decompose plant fibers have not yet appeared. This has led to a sharp decrease in the concentration of carbon dioxide in the air."

　　"A large amount of carbon elements were solidified and deposited underground along with the life cycle of plants, so that high-quality coal was formed in the Carboniferous after that, which benefited human beings who were born later."

　　"At the beginning, the decomposers of the earth were not strong enough. The proportion of carbon dioxide in the atmosphere dropped, and the proportion of oxygen rose sharply. In the late Carboniferous, it reached the stage of the highest proportion of oxygen in the atmosphere in the history of the earth. The sudden change in the environment caused the mass extinction of living things , There was another biological explosion."

　　Everyone here understands the rhetoric in this regard.

　　"And Riley Star is also in such a special stage. With the accumulation of time, there are more and more dead world trees, and more and more tree cores are accumulated."

　　"This planet has been formed for a long time. The concentration of carbon dioxide in the atmosphere is not too high, so where does the carbon come from? After the carbon dioxide in the atmosphere is exhausted~IndoMTL.com~Of course it is the carbon element in the living body. …Animals are born, old, sick, and die. As long as there are more dead creatures than born, as the entire world's carbon cycle is destroyed, more and more carbon elements will be buried in the ground!"

　　"The atmosphere lacks carbon dioxide. There will be fewer plants and fewer animals. On the contrary, the concentration of oxygen will rise.

　　 "The mass extinction, that's it, it's started!"

　　"In other words, the mass extinction has begun, but these Riley people did not know it. After tens of thousands of years, animals and plants are scarce, and a large amount of carbon has become this plastic-like substance...Theoretically That's it."

　　Everyone sat quietly in their seats, thinking, thinking.

　　 After the extinction of this creature was revealed nakedly, it was serious and full of heavy killing intent.

　　 comes from the killing intent of the planet itself.

　　This kind of murder has always been slow and firm.

　　Even, human beings as interstellar civilizations are very difficult to stop, this kind of power comes from the planet itself.

　　……

　　 (PS: I don’t have any comments about the silly online games, I feel so passionate to write!

　　Especially because it was being pushed in a strong wind these days, it was covered by the big red flag, which caused the collection to rise unsatisfactorily...Ah, it’s bad luck, but let’s celebrate three more! )

　　 (The National Day military parade is still quite spectacular, and the testimonials will not be published. I like the DF41 nuclear bomb the most. Although it cannot be used in wars, it means real safety!)