Final answer:
Protists and fungi are both eukaryotic, but they differ in cell wall composition and motility. Fungus-like protists have cellulose cell walls and can be motile, unlike fungi which have chitin cell walls and are mainly non-motile.
Step-by-step explanation:
The differences between protists and fungi are found in their cellular structures and modes of nutrition. Both are eukaryotic organisms, which means they have a true nucleus. Fungus-like protists, such as slime molds and water molds, share some similarities with fungi; for instance, they are heterotrophic, have cell walls, and reproduce through spores. However, their cell walls are composed of cellulose, unlike the chitin found in fungal cell walls. Furthermore, while fungi are strictly heterotrophic and mainly non-motile, fungus-like protists can be motile during certain life stages and have more complex life cycles, which include both asexual and sexual reproduction.