What do all members of the Protist Kingdom have in common?
Kingdom Protista includes eukaryotic organisms which don't easily fit into any other category. They vary by their method of locomotion and food-getting strategies. In terms of size, many members are unicellular, or, if multicellular in a colony for example, there is no evidence of tissue formation. They are simply cells that remain together without any higher level of organization. Some are animal-like, or Protozoa, some are plant-like, mainly algae, some are fungus-like, including slime molds. A common thread amongst this group is that they live in an aquatic or moist environment and have cells which contain organelles including an organized nucleus.