What will happen if all the animals are extinct? Can you tell us something about it?

If our earth is to maintain normal operation, then animals, plants and microorganisms are interdependent, and they are isomorphic with soil, water and climate, forming the earth's ecosystem. With the destruction of forests and environmental pollution by human beings, the population and quantity of animals have been decreasing. According to IUCN statistics, about14 mammals on the earth are on the verge of extinction. So, what will happen if all the animals are extinct?

Thousands of years ago, our ancestors domesticated some wild animals and became our domestic animals. They provide us with milk, meat and clothes, and even guard our homes. Bats, birds, squirrels and bees have made great efforts for forest reproduction and pollination. In a balanced biodiversity ecosystem, each species plays an important role and depends on each other to live together.

When a species disappears, it may affect the whole ecosystem and make the natural environment more fragile. Even if the species is not important in the ecosystem, its extinction will still have a certain impact. For example, the United States once intervened in the number of wolves on a large scale and almost wiped out the gray wolves in the United States. However, after the number of wolves decreased, the number of other animals began to increase greatly, such as rabbits and elk. These herbivores increased and began to destroy the local vegetation, and trees and grass began to decrease. The decrease of trees and grass gradually reduced the number of birds and insects. Later, they stopped hunting wolves, and when the number of gray wolves increased, the environment began to recover slowly.

According to the statistics of scientists, 75% of the world's food crops need insects and other animals to complete pollination, especially in the tropical rain forest, almost all flowering plants need animals to complete pollination. If there is no pollination by animals and insects, the output of crops and fruit trees will be greatly reduced, and even more seriously, some plants will become extinct. For example, bees can pollinate more than 250,000 kinds of plants, of which nearly 100 kinds are human food sources, such as sex apples, cucumbers and some crops. In the tropical rain forest, many tropical plants need preserved fruits for pollination and planting. At the same time, many drugs produced by human beings come from animals. For example, we get antihypertensive drugs from the venom of poisonous snakes and insulin from the pancreas of pigs. However, with the development of human beings, the speed of species extinction is accelerating, which is thousands of times higher than that of 100 years ago.