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The kingdom Protista is used to group most single-celled organisms, except bacteria and blue-green algae. Protista is a large and variable group containing both plant and animal characteristics. This group includes about 50,000 species of protozoans (first animals) and between 8,000 and 12,000 species of algae (simple plants).1. Blue-green algae are bacteria. Also, Protista does not include myxosporidia (animals) and yeasts (fungi).
Protists are mostly microscopic and have no organs or tissues. They are single-celled but may occur in colonies. They may be free-living on land or in water, or live in association with other plants and animals. Locomotion is achieved by waving tiny hair-like threads.