"The bigger the body, the greater the consumption?" Mizuki muttered thoughtfully.

When asked about this, it wasn't that Mizuki was particularly concerned about the progress of Shino's cultivation, and the study of the family's secret art was worried about by his parents. Mizuki cares about the problem of too much consumption that Shino the oil girl said.

In the ninja world, there is an issue that has been ignored by everyone for a long time, and even Mizuki is in such an environment, and has always been attracted to other things, and has not paid special attention to these issues. Although I felt that something was wrong, I didn't pay much attention to it.

This problem that cannot be ignored is that because of the influence of chakra in the ninja world, there is a high probability of biological mutation, and it is not uncommon for wild animals to become ferocious and large-scale. So much so that the birth of some super-large creatures that are clearly beyond the limits of nature is not an unacceptable thing. As for the sapient sapient creatures, they didn't attract the attention of the ninjas, who only saw them as psychic beasts and battle partners.

The conditions of the ninja world are enough to give birth to these super intelligent beings, and it is true. But is this really a normal phenomenon? Intelligent creatures and intelligent races are not the same concept, as long as Mizuki himself is willing to spend a little price, he will greatly transform his giant bear Bo Taijun to make it a giant bear that is smarter than ordinary humans. However, it is almost impossible to create a race of intelligent giant bears that can survive in the natural world.

The three holy places of psychic beasts, these magical places, there are two intelligent races, giant toads and giant snakes.

The slugs immortals in the Wet Bone Forest are too special and mysterious not to mention for the time being; only ten thousand snakes often appear in front of people in the Longdi Cave, and there is too little information there, and the specific situation is unknown; there are many toads that appear in Miaomu Mountain, and the three brothers Toad Wentai, Toad Jian, and Toad Guang; there are also two brothers, Toad Dragon and Toad Ji, who are the sons of Toad Wentai; there are also Zhima Immortals and Fukasaku Immortals above, and the top is Toad Pill. There are also the Iron Arm Toad, the Scroll Toad, the Iwasu Toad, the Toad Zhong, the Toad Force, etc., which are obviously not individual intelligent creatures, but a intelligent race.

As soon as he thought of this, Mizuki got up and said to Xiao Tsubaki beside him: "I'm in a bit of a hurry to eat, I'll pour some water to drink, you wait for me for a while, I'll come when I go." ”

After saying that, Mizuki didn't attract anyone's attention and quietly approached the backstage.

……

In an empty lounge, Mizuki was holding a water cup thoughtfully, when an identical figure walked in, and then closed the door with his backhand.

"Did you hear that, did you?" asked Mizuki, whose voice trembled a little.

"As you think, if you think about it, I probably wouldn't have a very different opinion. ”

Mizuki frowned, looked at the doppelganger and stepped forward, picked up the pastries that Mizuki had placed casually in the small bamboo basket on the table, and ate them. "It's delicious!"

"If my suspicion is true, it would be desperate. ”

Mizuki's clone said while eating: "I can't see Mount Tai in a leaf, in fact, we should have noticed it a long time ago." ”

"Do you remember some of the biological research results of the previous life? The so-called archaeologists who dig up fossils everywhere every day have unearthed many fossils of insects from ancient times, and they have found that the size of insects at that time was much larger than that of modern times. Do you know what that means a millipede the size of a matchstick might have been bigger than a snake hundreds of millions of years ago?"

Mizuki thought for a moment and replied, "There were indeed many large creatures in ancient times, but most of them were the result of the effects of climate change. ”

"Climate?" said Mizuki with a smile, "Probably, there are other theories of melting glaciers, rising sea levels, natural disasters, volcanic eruptions, super-large meteorites hitting the earth, etc., these are difficult to verify." However, one thing is clear, in ancient times, the oxygen content in the air on Earth was much higher than in modern times!"

"You know what it means to have more oxygen? More efficient aerobic respiration, which produces more energy, supports greater body exertion, means that the body can grow bigger. By analogy with the ninja world, have you found anything?"

"The amount of chakra, or natural energy, is decreasing, and it can be fatal to large creatures because of changes in the external environment that supports their normal survival. ”

This conclusion is not difficult to come to the conclusion, and the ontology can easily answer it.

"Like Toad Dragon and Toad Ji, when they were still tadpoles, they were easily summoned by Naruto Uzumaki's psychic skills; as they grew up, the time to appear became shorter and shorter; their father, Toad Bunta, was only channeled out when there was a fierce battle, and the Ten Thousand Snakes in the Dragon Cave were roughly the same; Zhima Immortals and Fukasaku Immortals, there were no major events of life and death, and basically no major events would appear; Toad Immortals and Snake Immortals, there were legends that they were active in the ninja world in the past, but now they will not appear in the ninja world at all; as for the slug immortals who are too big to guess, Tsunade and Sakura's Yin Seal storage chakra can't channel it completely, what do you think they are growing so big for, if they don't have to?

Now that this aspect has been thought of, there are some questions that cannot be avoided.

The competition and balance between wolves and sheep on the steppe. If a wolf runs slower than the slowest sheep, it will starve to death, and if a sheep can't outrun the fastest wolf, it will probably become prey and be eaten.

The ecological balance maintained by nature is such that competitors are always kept at the most efficient level of "just enough". If the wolf runs as fast as a rocket, it will either die of exhaustion because it consumes too much and cannot replenish its strength by constantly eating mutton, or it will eat all the sheep and finally starve to death.

"With such a big toad, there are naturally big insects that can feed it, and there will also be big snakes and waterfowl that eat toads, and giant eagles that eat big snakes and waterfowl. ”

"No matter how big the slugs are, there will be no shortage of oversized hedgehogs or other creatures that feed on them, otherwise the ecological balance of nature will collapse because of this accident. ”

"But now, we can't find any trace of their existence in the ninja world, maybe they were all killed and eaten by our ninja ancestors as prey!"

The doppelganger who said spread his hands and made an exaggerated gesture to liven up the atmosphere, but Mizuki couldn't laugh at all.