Why do some people say that insects in ancient times were larger than modern humans? On what basis?

Ancient times. The insects were larger than modern humans. Ancient centipedes.

Lived in what is now northeastern North America and Scotland.

In the Carboniferous period. The Late Period, about 100 million to 100 million years ago, is the largest known terrestrial invertebrate.

It was found that oxygen levels 300 million years ago were 25% to 30%. This is much higher than modern oxygen levels, which are only 21% and sometimes even 35%. Even 100 million years ago, oxygen levels were above 30%.

Scientists hypothesize that megafauna are highly correlated with oxygen levels, and that high oxygen levels 300 million years ago may have created giant insects. The concentration of oxygen in the atmosphere was significantly higher than it is today. Ancient centipedes breathed 31 to 35 percent oxygen in the air, compared to only 21 percent of the air they breathe today.

<> researchers report that until about 300 million years ago, many arthropods.

Oxygen is breathed through tiny ducts scattered throughout their bodies, rather than indirectly through the blood, suggesting that high oxygen levels may have helped insects evolve into larger bodies. But scientists speculate that high oxygen levels, in addition to making various plants and animals huge, are prone to causing more fires. At that time, it was possible that a single spark could quickly burn down a forest, and this is where the catastrophe of these giant insects began.

Scientists suspect that 100 million years ago, a fire covered the entire planet.

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I think it's because the environment was better and the air quality was higher, so the animals were relatively large. From the analysis of genetics and environment, animals will change their bodies according to different environments. So it's entirely possible that the environmental conditions at that time were good, and the insects grew bigger than they do now.

It's because in ancient times, those insects had no natural predators. They are generally very large, based on dinosaurs.

There are some fossils left from ancient times, and it can be seen from these fossils that insects were larger and larger in size than they are now.

During the Carboniferous period, 300 million years ago, giant insects lived on Earth, with a wingspan of nearly one meter.

Scientists have found through the fossil record that there were huge species on Earth before the dinosaurs, which were giant arthropods from the Carboniferous period 300 million years ago, including oversized mayflies, insects, and scorpions. Spider plant-sized spider. And 5-foot-long millipedes, and so on.

One of the most amazing is the giant dragonfly, which can reach a wingspan of two and a half feet (nearly one meter), the size of an eagle, and the largest insect ever seen on Earth. During the Carboniferous period, 300 million years ago, giant insects lived on Earth, with a wingspan of nearly one meter.

Scientists have long speculated that perhaps changes in atmospheric oxygen levels played a key role in their rise and fall. Now, paleontologists are asking whether the rise and fall of these ancient dragonflies, cockroaches, and other super-insects, which are about the size of today's eagles, is related to the super-high oxygen levels.

The investigators noted in the report:

During the Carboniferous period, the concentration of oxygen in the Earth's atmosphere was as high as 35%, much higher than the current 21%. Many arthropods absorb oxygen directly through the tiny tracheas that dot their bodies, rather than indirectly through the blood, so high oxygen levels can encourage insects to evolve in the direction of larger size.

Yes. Ants existed more than 100 million years ago and have survived until now.

Ants are social nesting insects that belong to the class Insecta and Hymenoptera. There are many species of ants, about 15,000 species in the world, and more than 300 species are known in China.

Ants are a very ancient class of animals that have been living on Earth for at least 100 million years. In the Amber of the Mesozoic Era (the age of the dinosaurs), ancient ants were found that were almost identical to today's ants.

In the Amazon jungle of South America, scientists have discovered a species of ant named "Martian ant". This ant lives in the Amazon, and is one of the oldest species in the world. They are said to have evolved since 100 million years ago, and they are rarely seen today.

These ants have no eyes, live in the soil, and rely on the hairs on their bodies to sense changes in the surrounding soil, and it is only in recent years that they have been discovered.

Insects such as ants, bees, cockroaches, etc., are indeed creatures of ancient times.

The first ants date back 100 million years and lived in the same time as the dinosaurs. However, the huge dinosaurs became extinct, but the tiny ants have continued to thrive to this day. Nearly 8,000 species of ants are known to exist in the world, surpassing all other terrestrial animals.

But after about 50 million years, a paleoclimate study published by Robert Bernard, a biologist at Yale University in the United States, and others confirmed this speculation.

The researchers pointed out in the report that the concentration of oxygen in the Earth's atmosphere was as high as 35% during the Carboniferous period, and perhaps changes in the amount of oxygen in the atmosphere played a key role in their rise and fall. Right now.

High oxygen concentrations created ancient giant insects.

Oxygen concentrations in the Earth's atmosphere during the Carboniferous period were as high as 35%.

Not so long ago, from the middle to late Permian, these giant species died out.

For a long time, 300 million years ago, most of the land was in the tropics, and plants flourished (after burying coal into the ground, hence the name Carboniferous), scientists speculate. Many arthropods absorbed oxygen directly through the tiny tracheas found throughout their bodies, rather than indirectly through the blood, and paleontologists began to wonder whether the rise and fall of these ancient dragonflies, cockroaches, and other super-insects, the size of today's eagles, was related to the ultra-high oxygen levels, which were much higher than the current 21 percent.

Which scientist said that? Wrong. Insects have been on Earth for hundreds of millions of years.

Insects belong to arthropods, and arthropods are the first animals to land.

In the early Ordovician of the Paleozoic Era, about 500 million years ago, plants began to land and evolved from algae to bryophytes that could initially adapt to life on land. At this time, there are aquatic arthropods that feed on plants and begin to try to land.

In the late Ordovician period, about 100 million years ago, when plants had evolved into ferns that were fully adapted to life on land, arthropods also evolved their ability to adapt to land, becoming the first land dwellers among animals.

At this time, as the most diverse and abundant group of arthropods, the earliest insects began to multiply on land.

The earliest insect fossil found so far, which is more than 300 million years old, is an insect similar to the current dragonfly.

Why were prehistoric insects so large, but now insects are so small?

No, even the largest insect in history, the giant veined dragonfly, has a wingspan of less than a meter.

Because insects have not evolved at that time, the living environment at that time was also very good.

According to Lenton's 2004 data, scientists found that the oxygen content reached 25-30% 300 million years ago, which is far higher than the oxygen content of modern times, and the modern world only survived 21%, and even reached 35% in some cases, even 100 million years ago, when the oxygen ranks were above 30%. Scientists speculate that giant animals are highly correlated with oxygen levels, and that high levels of oxygen 300 million years ago may have created giant insects.

Because oxygen levels were very high in ancient times, giant animals were highly correlated with oxygen levels.

That's because in ancient times, the climate and environment were much better than today, and the size of species was naturally much larger than now.

This is also similar to the oxygen content in ancient times, when the oxygen content was two or three times as much as it is now, which also created huge insects.

Because at that time, the living conditions were probably better than now.

Because of primitive insects, people don't hurt them, and then they develop very well.

Because the insects at that time did not have anyone to destroy and absorb much of the good stuff.

Because in ancient times, the concentration of oxygen was higher, and it was able to support such a large body size.

There is no such thing as "ruling the earth", but there was a geological time when insects on land became the largest terrestrial animals and could roam continents.

In the 100 million years between about 500 million years ago and about 400 million years ago, vertebrates (fishes) began to land, arthropods represented by insects became outstanding representatives of land animals, not only spreading all over the land and occupying almost all possible ecological niches on land, but also evolving wings and occupying the sky.

To this day, insects remain one of nature's most evolutionary and successful creatures.

Ancient giant insects ruled the Earth.