The general process of plant evolution

1. Algae

In the earliest period, the primitive single-celled organisms gradually turned into the most primitive algae, such as green algae, blue-green algae, etc. These originated in water, are very dependent on water, and cannot grow without water. With the evolution, the original single cell will gradually evolve into a multi-cell, and the structure will gradually become more numerous and complex.

2. Moss

The algae in the water gradually evolved towards land and turned into lower mosses, such as lichens, which have a very strong ability to adapt to the environment.

3. Ferns

As the earth's crust moves, some of the oceans will become land, and the plants in the sea will gradually evolve into ferns. At first, it was just an evolved naked fern, without leaves or roots, and it only grew on land by relying on rhizoids. Later, stems, roots and leaves will evolve, but reproduction still cannot be separated from water.

4. Gymnosperms

Later, due to climate changes and the movement of the earth's crust, the original ferns would disappear in large numbers, and the previous ferns would gradually evolve into gymnosperms, which could now completely leave the influence of water and adapt to growth on land.

5. Angiosperms

This is already the most advanced type of plant, with true flowers.