We now know that they have unique physical, chemical, and genetic traits that set them apart from plants and other eukaryotes. For example, the cell walls of fungi are made of chitin, not cellulose. Also, fungi absorb nutrients from other organisms, whereas plants make their own food.
Fungi don't have chlorophyll and cannot produce their own food, the bodies of fungi are made of masses of filaments woven together, the fungal cell walls contain chitin complex polysacharide.
