They belong to the phylum Porifera. Log in. See Answer. Best Answer. Study guides. Q: Why are protozoans not classified under Kingdom Animalia? Write your answer Related questions. Are bird classified as animals? What is anamalia? Why are protozoans classified under animal kingdom? What is the scorpions classification? Why are cats and honey bees both classified in the same kingdom?
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Are animals prokaryotes or Eukaryotes? Thank you for posting your question here in. We hope to answer more of your questions and inquiries soon.
Have a nice day ahead! Home 2. Why is the kingdom Protista not valid under evolutionary classification? Answered Out. You can't Rate this answer because you are the owner of this answer. The answer seems to be, "everything that is not obviously something else. The term Protista was introduced in by Ernst Haeckel, the same man who gave us the provocative but not quite correct theory that "ontogeny recapitulates phylogeny" as well as some astonishingly beautiful paintings illustrating his zoological theories.
Haeckel conceived the protist category as a kingdom of lower forms separate from animals and plants, comprising basically all microorganisms. Bacteria and Archaea, however, were kicked out of the protist kingdom when the separation between eukaryotes and prokaryotes was established in the 20th century.
The modern biology textbook now generally gives us a tree of life with three domains—Archaea, Bacteria, and Eukaryota—and confidently jutting out from the Eukaryota are four kingdoms: plants, fungi, animals, and protists. There is, to be sure, an astonishing diversity in all four kingdoms, but it is usually easy to distinguish a plant from an animal from a mushroom. Protists, however, have expanded beyond the simple organisms in Haeckel's original conception to become a ridiculously polymorphic category; included among them are tiny slime molds that live among rotting leaves, the Plasmodium parasites that infect our red blood cells and cause malaria, and the giant kelp that wave their fronds back and forth in the sea waves.
Where is the similarity?
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