What is a periodic mass extinction .

Why are horrific mass extinctions cyclical? Two hypotheses take you back to the roots!

Everyone must have heard of the mass explosion of species and mass extinction, there have been many species explosions and mass extinctions on the earth, the early organisms of the earth in order to adapt to the harsh environment at that time, continuous evolution and evolution became more and more complex, about 500 million years ago the earth began to appear complex life forms, known by human beings as the first known explosion of life. <>

The reason for the explosion of species is that the earth's environment has changed, and the change in the earth's oxygen level is a reason for the explosion of species, resulting in many animals and plants from the original prokaryotes and single-celled organisms.

Slowly evolved into much more complex cells and eukaryotes, and the nutrients in the environment in the process of accumulation for hundreds of millions of years, slowly became the original resources of the species explosion, the emergence of sexual reproduction is also a major cause of the species explosion, the emergence of sexual reproduction leads to the survival rate of the offspring becomes higher and higher, with many organisms begin to reproduce sexually, there are more and more genetic variations on the earth, and the diversity of organisms is further increased. caused a species explosion.

Then the mass extinction of organisms, is a phenomenon of the complete disappearance of organisms in a short period of time, there are many reasons for the mass extinction, many scientists believe that meteorites and asteroids hit the earth is a cause of the mass extinction of organisms, for example, the extinction of dinosaurs on the earth, that is, because the meteorite impact on the earth eventually led to the poor changes in the earth's environment, resulting in the extinction of the dinosaur race, in addition to this reason, there are volcanic eruptions.

Volcanoes produce a large amount of gas or volcanic dust after eruption, which can cause animals to suffocate and suffocate and block out the sun, resulting in a decrease in global temperatures, so volcanic activity and climate change are also one of the causes of species extinction events. <>

Generally speaking, the reason for the mass explosion and mass extinction of species on the earth is because of the earth, and the earth is caused by the environment of the earth, and it is also caused by the imbalance of oxygen and nitrogen in the earth.

Many scientists believe that the extinction was caused by infectious diseases, some say that the extinction was caused by meteorite impacts, and some say that the extinction was caused by supernova**, or it may have occurred due to changes in the climate and environment, or it may have been caused by volcanic activity.

This is due to the influence of environmental factors. The extinction of species and the impact on the environment are very large, and if the environment becomes very bad, then there is a risk of extinction of species.

The real causes of the five mass extinctions are many, both natural and human-made. Here are some of the main reasons:

Celestial impacts: Celestial impacts that have the potential to cause mass extinctions in both the third and fifth mass extinctions.

Emergencies: natural disasters such as volcanic eruptions, **, sea level changes, etc.

Climate change: Climate change may lead to the extinction or displacement of species, thereby disrupting the ecological balance.

Destruction of marine ecosystems: Marine ecosystems are being destroyed due to pollution, overfishing, and climate change, leading to the extinction of many species.

Human activities: Human activities are the main drivers of the sixth mass extinction, including deforestation, pollution, climate change, and ecosystem destruction.

The causes of the five mass extinctions are complex and diverse, involving both natural factors and human activities. Protecting ecosystems and species diversity and reducing human impact is key to protecting the planet's ecological environment.

It is currently in the fifth extinction. Although new species are being created, they are still extinct faster than they are created.

Species extinction refers to the gradual disappearance of biological species from the world due to natural or man-made causes. Biological species, like anything else, have a process of creation, development, and extinction. In the natural state, one species dies and new ones arise and develop, thus maintaining the diversity of biological species on the planet.

However, due to human intervention, the rate at which species disappear can be greatly accelerated. From 1600 to 1800, 25 species of birds and mammals on Earth went extinct; From 1800 to 1950, 78 species of birds and mammals on Earth became extinct. The causes of species extinction are mainly due to the destruction of the ecological environment, the irrational exploitation and utilization of human beings, the pollution of the environment and the introduction of alien species.

Species extinction is a huge loss of biological gene pool, which directly affects human production, life and the ecological balance of nature. Preventing species extinction has become a global imperative.

However, one thing to consider is that before the advent of humans, there were only two motives for animal evolution: natural selection and sexual selection; After the advent of human beings, a third dynamic emerged: artificial selection.

Therefore, human beings are partly responsible for the extinction of species after the emergence of human beings. Humans have begun to assume the role of God.