The first episode of Plant Kingdom introduced microorganisms, plants and animals. These three creatures are closely related and interrelated, forming a complete ecosystem. Among them, plants are the most important creatures in the plant kingdom. They not only provide food and air for human beings on the earth, but also regulate the climate and maintain biodiversity. There are many kinds of plants, which are generally divided into angiosperms, gymnosperms and bryophytes. In addition, there are microorganisms and animals in the plant kingdom. Microorganisms are tiny organisms, mainly distributed in soil, water and air, which can promote the growth of plants and thus play an important ecological role. Animals are an important part of the plant kingdom, and they are interdependent with plants, so they are important elements in the plant kingdom.