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Protists are incredibly diverse eukaryotic organisms. Modern classification systems divide these organisms into several different groups because many are not closely related to each other. However, the general term protist is still used to describe any eukaryotic organism that is not an animal, land plant, or fungus. Most are unicellular, but some form colonies or are multicellular. Protists live in aquatic or moist environments. Many are motile, using external structures to move. Such structures include whiplike tails called

flagella,

beating hairlike structures called

cilia,

or footlike extensions of cytoplasm called

pseudopodia.

Some protists have cell walls, but most do not. When present, these cell walls may provide protection, support, and even buoyancy. Their composition can vary, but unlike fungal cell walls, protist cell walls do not rely on chitin as a key structural component. Many protists have chloroplasts and produce their own food through photosynthesis. Others are heterotrophic and get nutrients by absorbing or ingesting organic matter. They can reproduce either asexually or sexually, depending on the species.

Select the true statements about protists.