1、 Born

Hundreds of millions of years ago, algae appeared on the earth. Green algae is one of them. It is not much different from other algae. It has no chlorophyll and can only rely on the external environment to absorb nutrition. In the later stage, there were cyanobacteria in the ocean. They appeared photosynthetic bacteria, strictly speaking, the origin of plants, which can absorb sunlight and release energy for their own growth. Plants will gradually change from simple to complex, from aquatic to terrestrial. At first, they are algae that appear in the ocean. With the growth and evolution, they gradually leave the ocean. Note that if it is divided through the binary boundary, organisms will only be divided into plants and animals, then fungi are the earliest plants. If it is divided through other methods, the birth of primitive plants is algae

2、 Evolution

At the beginning, algae were only single celled plants. After a long evolution process, they evolved into multicellular algae, and the growth structure became more and more complex. Later, due to the violent movement of the earth's crust, some of the original oceans evolved into land, in which the algae in the ocean evolved into ferns, which can more easily adapt to the land environment. In the later stage, because the land climate is relatively dry, ferns will also evolve into gymnosperms, which can completely get rid of their dependence on water