Here's why:

* Eukaryotic: Fungi have a true nucleus and other membrane-bound organelles, characteristics of eukaryotic cells.

* Heterotrophic: Fungi cannot produce their own food and rely on absorbing nutrients from other organisms.

* Cell Walls: Fungal cell walls are composed primarily of chitin, a strong and rigid polysaccharide.

Let me know if you'd like to learn more about fungi!