What Are Protists?
protists, also known as Protozoa, can simply be classified as eukaryotic organisms, in which they have a nucleus and other membrane bounded organelles. Most protists are unicellular, where they are understood as the simplest of all eukaryotes, but can be explained as some of the most complex organelles in it's kingdom.
Protists can be divided up into sub-categories by their nutritional intake:
1. Photoautotrophs - contain chloroplasts
2. Heterotrophs - absorb organic molecules/ingest larger food particles
3. Mixotrophs - combine photosynthesis and heterotrophic nutrition.
here is a Youtube Video on the Protist, Euglena!