"Kneeling is a basic human position where one or both knees touch the ground. Kneeling is defined as “to position the body so that one or ...
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both knees rest on the floor,” according to Merriam-Webster. Kneeling when only composed of one knee, and not both, is called genuflection.
Kneeling is a primate behavior used to convey deference by making the figure kneeling look smaller than the other. Primates themselves establish pecking orders that are important to the survival and behavior of a group. Chimpanzees, for example, have a complex social group that involves a dominant male and corresponding female with the other submissive males and juvenile chimps. Males who threaten the hierarchy are often severely injured or killed; thus the use of submissive behavior is necessary in order to ensure survival in some instances." - (en.wikipedia.org 17.07.2022)