How does bacteria without a nucleus reproduce. plz

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

I’m stuck on this question cuz i’m stupid sksksksk