Question

identify the independent variable and dependent variable in this experiment. the number of bacterial colonies the amount of antibiotic independent variable dependent variable

Explanation:

The independent variable is what the experimenter manipulates. Here, the amount of antibiotic can be controlled by the experimenter. The dependent variable is what is being measured or affected by the independent variable. The number of bacterial colonies is likely to be affected by the amount of antibiotic, so it is the dependent variable.

Answer:

Independent variable: the amount of antibiotic
Dependent variable: the number of bacterial colonies