The Kingdom of Protista Scott Mayer March 28, 2010 Biology Period 6
What is a Protist ?
Protist-Eukaryotes that are not members of the kingdoms plantae, animalia, or fungi.
A protist is any organism that is not a plant, animal, or prokaryote.
Most protists are unicellular, but few have hundreds or even thousands of cells.
Evolution of Protists
Protists were the first eukaryotic organisms on earth which first started appearing 1.5 billion years ago.
Some organelles in eukaryotic cells were once symbiotic prokaryotes that lived inside other cells.
Types of Protists
Animal-like: assembles cytoplasm to help wrap around prey
Fungus-like: contains hyphae to look like fungi, also acts as decomposers by releasing enzymes.
Plant-like: They can make their own food (autotrophs)
Biologists have called protists the most diverse organism on the planet.
Protists either obtain food from the sun (photosynthesis), or from external digestion (decomposers).
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