Protista is a large and variable group containing both plant and animal characteristics.
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. An amoeba is an organism that is readily found in pond water and gets it's name from the Greek word for change, amoibe . The outline of the single-celled body changes constantly as it moves and has no permanent shape.