Deep Space Fleet

Zhang Zhangyuan carefully observed this so-called tree heart, with some hollow sieve tubes in the middle, and the overall density was much lower than steel.

Sheshan's original saying is astonishing, "For the Riley civilization, these tree hearts are very good materials, providing shelter, and food ... but also a major crisis that destroys the entire ecological chain!"

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

Suddenly, the entire burning phenomenon produced a faint smoke.

Zhang Yuan covered his nose and smelled a scorching smell of burning plastic, thoughtfully.

Everyone smelled this smell.

"It really looks like plastic."

"What is plastic?"

Zhang Yuan explained: "It is a polymer material that is brightened from petroleum. It is very cheap. Earth civilization has been widely used, but after the oil is depleted, it is useless and can only be converted to a large number of renewable materials. . "

Sheshanben pressed the button again, "Did you smell it? The tree heart of this type is a natural polymer material, and its chemical composition is somewhat similar to the plastic widely used on our planet, which is a very stable chemical."

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

"The composition of this organic mine is almost all the heart 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 heating value."

Some thoughtful agile biologists have responded, why Professor Yamamoto Ichiro thinks that the planet is about to undergo a mass extinction event!

Why?

"Because of these tree hearts, they can't ... be decomposed by native microorganisms! So they will pile up in large quantities."

Zhang Yuan was surprised and speechless. Human beings were able to witness with their own eyes ... a mass extinction!

The so-called "world tree" of the Rileys is undoubtedly a very good species on this planet, providing food to Rileys and providing a place to live.

Because of its strong ability to adapt to the environment, the traces of the "World Tree" can be found in almost every corner of the planet.

But because of the "tree heart" of the world tree, it has evolved too far ahead, making native microorganisms completely unable to break down this highly stable substance.

的 A large number of organic mineral veins found on the plain by humans are in the original forest. The other fibers are rotten. They are formed only when the core of the tree accumulates and sediments in the ground.

Why do you say that this would cause a mass extinction?

It's simple because the carbon cycle of the native planet is destroyed.

通常 The general situation of aerobic breathing, consumers inhale oxygen, exhale carbon dioxide, and producers inhale carbon dioxide, producing oxygen, forming a carbon cycle.

现在 But now, a large amount of carbon has become the heart of the tree sinking underground, which will cause the concentration of carbon dioxide in the atmosphere to gradually decrease. Plants do n’t have enough carbon dioxide and die in large numbers. Then animals die in large numbers.

星 The planet ’s carbon dioxide concentration is about five thousandths, millions of years, and tens of millions of years later, it may reduce the carbon dioxide by%. At this time, it is difficult for plants to reproduce and produce real lethality.

A biologist sitting below asked, "Something that native microorganisms can't break down? Professor Yamamoto, are you sure that your scientific research is correct?"

This problem was explained by an expert in charge of the geography expedition: "We have found the active components of the tree heart in the soil around the world ... Although these substances are high molecular organic substances, they will become small fragments due to physical effects. In the end, but even these fragments are extremely slow to decompose, and they can stably exist for thousands of years, even tens of thousands of years. This shows that the decomposers of this planet cannot indeed decompose the heart of the world tree.

"How to say it, just like plastic. Although small plastic particles are not poisonous, they will not be broken down for a long time buried in the ground. The active ingredients of the tree heart are even more stable than plastic and can exist for a longer time. . "

Zhang Yuan nodded.

This is the origin of the Great Crisis.

专家 The expert continued: "Ladies and gentlemen, this situation of environmental mutations due to plant evolution is not unprecedented on the earth ..."

"2.4 billion years ago, there was a 'big oxygen event' on the earth. The big 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, mainly because of the large-scale evolution of plants, wood fibers have begun to form, and the fungi that break down plant fibers have not yet appeared. This has led to a sharp reduction in the carbon dioxide concentration in the air."

"A large amount of carbon is solidified and deposited into the ground along with the life cycle of plants, so that after the Carboniferous Period, high-quality coal was formed, which benefited humans who were born later."

"At first, the ability of the earth's decomposers was not strong enough. The proportion of carbon dioxide in the atmosphere decreased and the proportion of oxygen increased sharply. It reached the stage of the highest proportion of atmospheric oxygen in the earth's history in the late Carboniferous. The Big Bang. "

All of you here understand this statement.

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

"This planet has been formed for a long time. In the atmosphere, the concentration of carbon dioxide is not too high, so where does the carbon element come from? After the carbon dioxide in the atmosphere has been consumed ~ www.readwn.com ~ Of course, it is a carbon element in the body ... … Animals are old, sick, and dead. 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 underground! "

"The atmosphere is deficient in carbon dioxide, and there will be fewer plants and naturally fewer animals. The concentration of oxygen will rise instead.

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

"Or, the mass extinction has begun, but these Rileys didn't know it. After thousands of years, plants and animals were scarce, and a large amount of carbon elements became such plastic-like substances ... in theory. "

Everyone sat quietly in his seat, thinking, thinking.

后 After the extinction of this kind of creature was exposed naked, it was serious and full of murderous intention.

Comes from the killing intention of the planet itself.

杀 This kind of murder is always slow and firm.

Even human beings as interstellar civilization can hardly stop this kind of power from the planet itself.

Uh ...

PS (PS: Without the silly 屌 online games reviews, I feel so good without passion!

Especially in the past few days, it is still being pushed by the strong wind. As a result, it was covered by that big red flag, which caused the increase in the collection to be unsatisfactory. )

(The National Day military parade is still spectacular, and the testimony will not be published. I like the nuclear bomb DF41 the most. Although it cannot be used for war, it means real security!)