Robert Whittaker proposed a five-kingdom classification in 1969, and the Protista kingdom was one of the five kingdoms.
The creatures that make up this kingdom share a common feature: they all have a simple cellular structure that is free of superfluous tissues and organs
One of the most distinguishing features of Protista is their ability to reproduce both sexually and asexually.
Protists can move and remain immobile at the same time.
While some protists are ambulatory, using cilia, flagella, and pseudopodia as a form of transportation, others are sedentary.