Protoctists

Protoctists are microscopic single-celled organisms.

Some protoctists, such as Amoeba, have features like an animal cell. Others, such as Chlorella, have chloroplasts and are more like plants.

Some protoctists are pathogens. For example, Plasmodiumis, the pathogen that causes malaria.

An amoeba
The amoeba is a protoctist that lives in pond water