Answer:
This can't be answered without any information about the experiment itself. However, the explanation below may be able to help you answer it.
Step-by-step explanation:
The independent variable is the one thing you change in the experiment. e.g. the type of liquid used to water a plant
The dependent variable is the thing you measure due to the indepent variable changing. e.g. the height the of the plant
Controlled variables is everything in the experiment (except for the independent variable and dependent variable) that are kept constant (the same) throughout the entire experiment. They must not be changed. e.g. Type of plant used, pot size, amount of liquid, soil type etc.