Final answer:
Most protists are unicellular, but there are some multicellular protists.
Step-by-step explanation:
Most protists are unicellular (one-celled) eukaryotes, but some protists are multicellular. For example, kelp is a multicellular protist that can grow to be over 100-meters long. However, multicellular protists do not show cellular specialization or differentiation into tissues, unlike the cells in your body that have different shapes and functions.