Question

What will happen if microorganisms do bot exist on earth?

Answer 1

Life would cease to exist. Even though some of these tiny living things can cause chaos to humans, animals and plants (agriculture), they also perform many necessary functions that are part of the cycle of life. Such as, when a human, plant or animal dies bacteria break it down into a form that becomes fertilizer (food) for plants. We and animals eat these plants. We and other animals eat the animals that eat the plants. Thus the cycle continues. There are many other examples of important things microorganisms do, this is just one.

Answer 2

There Are Trillions Of Micro Organisms In The World. Some Are Good & Some Are Bad. Microorganisms help us to make food digest food.
So If They will not exist human can not survive.