AP BIOLOGY

Detailed explanation-1: -"Protista", “Protoctista", and “Protozoa” are therefore considered obsolete. However, the term “protist” continues to be used informally as a catch-all term for eukaryotic organisms that are not within other traditional kingdoms.

Detailed explanation-2: -The Protista kingdom is paraphyletic-it contains the common ancestor but not all its descendants-and it includes those eukaryotic organisms that are not deemed to be animals, plants or fungi such as protozoa.

Detailed explanation-3: -The kingdom Animalia includes all multicellular, eukaryotic, heterotrophic organisms whereas, the kingdom Protista includes all unicellular, eukaryotic and heterotrophic organisms. Hence, Protozoans are placed under the kingdom Protista instead of the kingdom Animalia.

Detailed explanation-4: -Protists are eukaryotic organisms belonging to the Kingdom Protista. Protists are highly diverse and do not have much in common with one another. They are grouped together because they don’t fit into any other kingdom; put simply, protists are all the eukaryotes that are not animals, plants, or fungi.

Detailed explanation-5: -One of the most striking features of many protist species is the presence of some type of locomotory organelle, easily visible under a light microscope. A few forms can move by gliding or floating, although the vast majority move by means of “whips” or small “hairs” known as flagella or cilia, respectively.