Final answer:
Protozoans can be found in various aquatic environments and some can live inside or on other organisms, including humans.
Step-by-step explanation:
Protozoans, which are single-celled organisms categorized under the protist group, can be found in various habitats.
Most species of protozoans live in aquatic environments, such as freshwater, marine environments, and bodies of water like lakes and puddles.
Additionally, some protozoans are free-living while others are parasites that live inside or on other organisms, including humans.