Cách sử dụng
Lichen is a word used to describe a type of plant that grows on rocks, trees, or other surfaces. Lichen is very special because it is actually made up of two different living things – a fungus and an alga (a type of small plant) – that work together to survive. Lichen can come in many different shapes, sizes, and colors, but all types of lichen are important because they help to create soil and provide food and shelter for animals in their ecosystem. If you see some strange-looking patches on a rock or tree, it might be lichen!