Answer:
The first negative behavior of a protist is that they cause several diseases in plants and animals while the second negative behavior is that they are act as a parasite.
Step-by-step explanation:
Some protist act as a parasite and causes several disease in plants and animals. Protists are unicellular organism while fungi is multicellular organism. The cell wall of fungi is made of chitin whereas the cell wall of protist is composed of cellulose. Some protist are heterotroph and some are autotroph while fungi are heterotrophic in nature.