If you mean fungus, then it is helpful in many ways.
It has saved many lives because it has ingredients for medicines. like Penicillin.
It is also used to create important foods. Like breads candy, soda, and soy sauce.
No, humans can't have fungs.
Copper arsenate is frequently used for the treatment of wood against insects, fungs, bacteria.
humans....we eat cows and cows eat grass...
They are not all many celled. Yeast is a fungs and is composed of just one cell.
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