Which best explains why it is difficult to classify protists?.

Protists are difficult to characterize because of the great diversity of the kingdom. These organisms vary in body form, nutrition, and reproduction. They may be unicellular, colonial, or multicellular. Protists can be free-living, or they may live symbiotically with another organism.

Explanation:

Hope this helps

i think its the first one

1. what is the relationship between the shape of an enzyme and the reactions they catalyze?

2. how does an enzyme inhibitor work?

separate your answers so i dont get confused : )