what is the use of a single celled organism like the amoeba in our lives?

Answer 1

to teach it

Answer 2

There may be no use for an amoeba in our lives,
but there is no reason why there should be. The
world does not exist for the benefit of human
beings, despite what some religions have taught.
Mark Twain had a delightful comment on this, I
think it was titled Was the world made for man?.
He points out that, if you represent the age of the
universe (which he had too short) with the height
of the Eiffel Tower then the length of time humans
have existed is about equal to the thickness of the skin of paint on the ball on top of the tower and, as
he says "Anyone could see that that skin of paint
was what the tower was built for."

Answer 3

Amoeba offers a sense of delight,watching and learning from it.
You watch it move, it is great.
The streaming and fountain flow movement of cytoplasm give a perspective.
The way it engulfs a paramecium to constitute a food chain is awesome
The manner in which it lives a solitary life gives us solace.
It does not dangle around a female, something one ought to take a note of.
It knows how to survive in the adverse situation.

Answer 4

They are part of the life circulation. They have metabolism. Our oxygen is mainly produced by single celled organisms in oceans ( not the trees ). They have other uses. For example Bread, Wine and Beer are products of single cell organisms! Also many of them are pathologic ( Its not a use in our lives! but an effect on our lives ;) )