Answer:
Chitin, is the third layer of the cell wall of fungi.
Step-by-step explanation:
As other living things, the cell wall is made by different compound, this allowed to protect and to pass some nutrients inside the cell.
The first layer is made by nanoproteins, these molecules provides structure and protection. The second one is made by glucans (some carbohidrates), that allows to carry some nutrients or wastes inside or outside the cell. The third one is made by chitin. Next to the cell wall it comes the cell membrane with their proteins and lipids.