Why has the rate of extinction of mammals since the 16th century increased by 80,000 times that of t

Every hour, a species is forever extinct from the earth, and it is hard to imagine that a species that survives thousands of years of natural selection evolution ends its strong evolutionary history in an hour. This is just a microcosm of the path of wildlife being driven to extinction by humans. The history of the development of human society can be said to be the history of the continuous development of human beings using wild animal and plant resources.

However, in the nearly 200 years since the Industrial Revolution, with the expansion of population and rapid economic development, the variety and abundance of wild animals and plants have decreased at an alarming rate. According to scientists' estimates, due to the strong disturbance of human activities, the rate of loss of species in modern times is 1,000 times faster than the rate of natural extinction and 1 million times faster than the rate of formation, and the rate of species loss has accelerated from about one species per day to one species per hour. According to the world's Red Book, 110 species and subspecies of mammals and 139 species and subspecies of birds disappeared from the earth in the 20th century.

Since the 16th century, about 150 species of birds, 95 species of mammals, and about 80 species of amphibians and reptiles have become extinct on the earth. At present, 593 species of birds, more than 400 species of mammals, 209 species of amphibians and reptiles, and more than 20,000 species of higher plants are endangered in the world. In addition to the irresistible natural history and natural disasters, human activities are the main causes, especially the predatory use of wild animal and plant resources by human beings due to commerce, which is an important factor causing species endangerment and even extinction.

At present, the scale of illegal wildlife smuggling in the world has reached an alarming level, becoming the third largest illegal after arms and drug smuggling. 1 trained Saker is worth $5,000 to $20,000; 1 parrot is worth about $4,000 to $40,000; 1 kilogram of musk is worth $50,000; 1 Tibetan antelope scarf worth $35,000; 1 orchid** can also be as high as $2,000; A candelabra cactus can reach $7,000. The monetary size of all this amounts to at least more than $6 billion.

Seeing such a series of figures, it is not difficult to understand why wildlife is legal and illegal** and why it is so popular.

Because of environmental destruction, the living space of animals is small.

The climatic conditions are constantly harsh, and the living environment is destroyed.

Because the environment is constantly being destroyed.

Because humans began a large-scale hunt.

Because human beings need to prey on other animals for survival.

The natural environment on which they depend has been destroyed.

This is because the development of animals requires predation on each other.

Since the beginning of the 16th century, humans have been hunting mammals at an increasing rate.

The environment is no longer suitable for mammals.

Humans prey on other creatures in order to survive.

Summary. Hello, 1 ...The Ice Age, caused by the Fairy Wood event 20,000 years ago, caused the mass extinction of the Earth's terrestrial large mammals.

What event 10,000 years ago caused the mass extinction of mammals.

Hello, 1 ...The Ice Age, caused by the Fairy Wood event 20,000 years ago, caused the mass extinction of the Earth's terrestrial large mammals.

Hello, 1 ...The Ice Age, caused by the Fairy Wood event 20,000 years ago, caused the mass extinction of the Earth's terrestrial large mammals. Yes. Good.

At the end of the 20th century, there were more than 400 species of lactating animals on the verge of extinction. （）

a.That's right. b.Mistake.

Correct Answer: a

As long as we humans appear, everything will change dramatically, not enough reptiles and mammals, both of them are in our great human beings, in fact, but they are a drop in the bucket, because we humans have the best **, which is the brain. The extinction of mammals did play a very important role in the rise of mammals, however, the rise of mammals depended on the outcome of two mass extinctions, the other being the Cretaceous mass extinction.

However, the Cretaceous mass extinction pales in comparison to the mass extinction at the turn of the Triassic in terms of the unprecedented degree of extinction. Permian Triassic extinction is also known as the P-t event, it completely ended the Paleozoic Era for more than 300 million years, and because the world of high-trapped first-class organisms was almost halved, more than 95 species completely disappeared from the earth, and the beautiful blue planet on which we humans lived was born 6.4 billion years ago, during this long time, our earth is constantly evolving and evolving, so there is such a good environment for life to survive.

However, as vibrant as the Earth is now, in the course of its growth, it has experienced five major and minor disasters, each of which devastated more than half of the Earth's life, and then one of the more serious events was the Permian extinction. The extinction of Permian species and marine life reached 96, which was caused by global warming in ancient times, which led to the Permian extinction event.

It has been 25.2 billion years since then, when all the animals of the Permian period were almost at an end, but at this time, this very frightening thing happened on our planet. At that time, 70 percent of the creatures on land were extinct, and the number of creatures in the sea was even more extinct, so that in the organisms of the time, they began to die rapidly and massively in an environment where there was not enough oxygen.

The question of whether the extinct mammals of the late Permian period would have dominated the Earth in advance will be explained here today.

Is the extinction of large mammals an evolutionary error, or does it stem from humans' treatment of nature.

The ancestors of birds were theropod dinosaurs, and the earliest birds of the world were about 100 million years ago. Tour pants.

The ancestors of mammals are theropores and reptiles, which have nothing to do with dinosaurs, and mammals appeared about 100 million years ago.

The first dinosaurs appeared about 100 million years ago, and the dinosaurs became extinct about 65 million years ago.