The basic structures of Protozoa include the following
- Locomotory organs such as Flagella for movement
- Pellicle which their bodies are covered with
- Contractile vacuole for those who live in freshwater.
Protozoa is an eukaryote because its nucleus is well defined due to the
presence of nuclear membrane . It is also referred to as a unicellular
organism.
The basic structures of a protozoa can be seen under a light microscope
and a common example is Amoeba.
Read more about Protozoa here