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Chapter 19 Protists KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms. Chapter 19 Protists 19.1 DIVERSITY OF PROTISTS Chapter 19 Protists Protists can be animal-like, plantlike, or funguslike. • Protists: Eukaryotes that are not animals, plants, or fungi – – – – members of the Protista Kingdom single celled or multicellular microscopic or very large reproduce asexually and/or sexually Chapter 19 Protists Protists can be animal-like, plantlike, or funguslike. • Protist are generally divided into three groups based on how they get their food: – Animal-like (consume other organisms) – Plantlike (make own food) – Funguslike (decompose other organisms) Chapter 19 Protists • Animal-like protists consume other organisms. – heterotrophs – single-celled – Not animals because animals are multicellular and animal like protist are single-celled Chapter 19 Protists • Plantlike protists are Make their own food through photosynthesis (autotroph). – single-celled, colonial (live together in colonies), or multicellular (kelp) – Not plants because they have no roots, stems, or leaves Chapter 19 Protists • Funguslike protists decompose dead organisms. – Heterotrophs. – can move at some point in their life cycle whereas fungi cannot. Chapter 19 Protists Chapter 19 Protists Protists are difficult to classify. • Four of the six Kingdoms are Eukaryotes – Plant – Animal – Fungus Difficult to classify because Many are only distantly related to – Protista each other. Many are more related to organisms in other kingdoms. Chapter 19 Protists Protists are difficult to classify. • Protista is often called the junk drawer of the kingdoms. – Eukaryotes that do not fit into any other kingdom: - Animal like but not quite an animal - Plantlike but not quite a plant - Funguslike but not quite a fungus Chapter 19 Protists • Protist classification will likely change. – Some protists are not closely related. – Molecular evidence supports reclassification.