First place: bees

It hurts to be stung by bees, but without bees, human beings can't live. There are more than two million kinds of bees in the world, and they are all doing the same important thing, producing food. In fact, even Einstein once said that if bees disappear from the earth tomorrow, human beings can only live for four years at most. Although scientists now think this is a bit exaggerated, bees are still one of the most important species on earth. Bees make honey, which is an important source of human sugar. But more importantly, bees are the most effective and greatest pollinators in the world. It is said that about 80% of the grain in the United States depends on bee pollination, and the situation in other parts of the world is similar to that in the United States. Pollination is the process of transferring pollen from male plants to female plants. Without this process, plants can't reproduce, and animals will die without plants to eat.

Second place: Bat

Although the appearance is chilling, bats are actually great heroes. Bats will not take the initiative to attack people unless they are threatened. There are 12000 kinds of bats in the world. Bats can protect our crops from pests. Bats can eat millions of pests, which can reduce the use of pesticides, harmful chemicals in pesticides can cause cancer. Bats can also kill insects that carry diseases, such as mosquitoes. A bat can eat 1000 mosquitoes in an hour, which can reduce the incidence of dengue fever and malaria. Bats are also great pollinators. When bats suck nectar from flowers, they get pollen, because bats have another environmental advantage when they travel far away. Bats spread seeds, especially fruit bats, which are extremely important for seed spread. Unlike other animals that spread seeds, bats fly far, which enables plants to live in different areas.

Third place: plankton

For a long time, plankton has been misunderstood as belonging to plants, but it actually refers to any creature that lives in water and cannot move independently. They are the reason why they can breathe oxygen, through photosynthesis and some healthy diets. Phytoplankton and zooplankton can convert energy into oxygen and disperse oxygen around the world. Please take a deep breath and say thank you, because plankton produces half of the oxygen on the earth.

Fourth place: ants

There are about 12000 species of ants in the world, and human beings rely heavily on the decomposition function of ants. Like earthworms, ants can dig holes, but they have other important functions. In this process, ants ventilate the soil, which helps to recover nutrients from the soil. Conducive to the growth of plants, without ants, ants like to eat pests, such as fleas, fly eggs and bed lice, which can carry parasites harmful to human beings. Plants can balance the oxygen and carbon dioxide content of the earth. Humans exhale carbon dioxide, and plants convert it into oxygen for humans to breathe again.

Fifth place: earthworm

These humble creatures are the kings of the land. Earthworms build holes in the soil, which can let more oxygen and water into the soil. This is important for other invertebrates living in soil and plant roots. The habitat of earthworms can improve biodiversity. Wherever earthworms go, bacteria and fungi follow. Although it doesn't sound like a good thing, this creature can help break down nutrients and help plants absorb nutrients. Earthworms are like nature's plows, mixing different soil layers, spreading nutrients and making the land fertile. Even their droppings are important because they turn the land into crumbs.