Answer:
Unicellular
Step-by-step explanation:
Protists can be defined as a group of eukaryotes that can not be regarded as fungi, animals or plants. These type of organisms are known to be very diverse. They are mainly microscopic in nature and are also known to possess a single cell. That is they are unicellular.
This unicellular attribute is the primary or main differentiating feature between protists and other eukarya.