Euglena is a unicellular protist. other examples of protists include amoeba and paramecium. euglena are unique because they behave like plants and like animals depending on the environment. they have a light-detecting eye spot that detects light. because of this, we might expect euglena to a) use chlorophyll to make sugar. b) search for prey as a predator. c) use the eye spot to find other euglena. eliminate d) use the eye spot to swim away from the light.