PROTOZOANS: Protists that have resemblance to animals are known as protozoans. They in moist and watery enviroments. The characteristics similar to animals are - their ability to move and their inability to produce their own food (heterotrophs). They differ from animals being unicellular while animals are multicellular.
DIVISION (depending on how they move):

ALGAE: Plant-like protists have chlorophyll like that in plants. The green substance in their cells enable them to make food bu photosynthesis. They produce and release oxygen like the plants. It is believed to be the most supply of oxygen on Earth is from the plant-like protists. The plant-like protists are the major food source and primary producers for water organisms. 

Protists can be heterotrophic, which means they obtain the energy they need to live by consuming other organisms. Or, they can be autotrophic, which means they obtain energy from the environment through photosynthesis, the process of capturing light energy and storing it in carbohydrates. 

Protists primarily live in water, though some live in moist soil. They can be found almost anywhere on Earth where there is liquid water, even in humans.