Why was the Protista kingdom formed?

Question

T one time there was only two kindoms, Plantae and Animalia. Then a third kingdom was formed. What was this third kingdom? Why was it formed?

*** Also, In time a fourth kingdom-Monera-was formed. Why is it nessacery to have this kingdon?

Answer 1

Monera and Protista were created to distinguish between cellular features (see below) of many microbes.

Biologists have done away with the 3-6 kingdom system of classification and now recognize the "Three Domains" of life. They are Archaea (formerly most Monera), Bacteria (sometimes called Eubacteria, meaning "true bacteria"), and Eukaryotes. This system is useful for classification of organisms based on their traits, and also best represents their evolutionary relationships.

Archeae and Eubacteria are prokaryotes and both lack many features that Eukaryotes possess, like a defined nucleus. They differ from each other in their machinery for important cellular functions, specifically translation and transcription.

Answer 2

Kingdom Protista was a "catch-all" kingdom for organisms that weren't clearly plants or clearly animals.

Even in a 6-kingdom system the Kingdom Protista includes organisms that don't belong anywhere else. It's like a miscellaneous file. Algae, slime molds, protozoa.

Answer 3

It replaced right into a wastebasket taxon containing organisms no longer descended from a different situation-loose founding member. The club had differing ancestry meaning the class replaced into polyphyletic. The third decision says lots the comparable factor in distinctive language. solutions a. and d. are literally beside the point.