@ Trippy,
@ humbleteleskop,
I hope that I am not "stepping on anyone's toes" by interjecting.
Would you say a human body is a symbiotic system of many different little organisms working together (for some reason)?
No.
The various specialized cells of the individual human body "work" in unison (the reason!) to maintain the viability of that individual human body.
These various specialized cells are Not "different little organisms". They are produced by, and share the exact same DNA as most every other cell composing that individual human body.
The human body has though, evidently through evolution, developed a
"symbiotic relationship" with certain "little organisms" that aid in different processes that the human body utilizes to maintain it's viability.
One example would be the bacteria(little organisms) that are present in the human digestive tract. They help to break down food and / or produce enzymes, that the human body does not produce by itself, that help with digestion. If my decrepit memory serves me correctly, they are mostly gram-negative Bacteroides.
Incidentally, again if my decrepit memory serves me correctly, there are literally hundreds of different types(?) or species(?) of bacteria that are "hosted" by the respiratory and intestinal (as well as other) systems of the human body.
What in the world they want from us, why are they doing it?
Possibly/probably, "what they want" would be a place to call home.
Possibly/probably, "why they are doing it" is the mutually beneficial continued existence of both members of that "symbiotic relationship".
Do we rule over cells in our body, or do they rule over us?
My personally biased, prejudiced and therefor predominantly Subjective opinion is that they "Rule over Us".
My purely Objective opinion is that they "Rule over Us".
If, and I repeat, If, we(as human beings!) "ruled over" the constituent cells of our body, we would theoretically have Zero problems with diseases, illnesses, infections, aging...etc.
humbleteleskop, is not the ultimate aim of the Medical Sciences to usurp that "Rule"?
Again, Trippy and humbleteleskop, I sincerely hope that I have not wrongly interjected my views into your discussion.