Question

what is the independent variable?
coconut juice
the amount of coconut juice used
water
the amount of water used
whether coconut juice or water was used
side of shower sprayed with coconut juice
side of shower sprayed with water
2 sides of the same shower are used in the experiment
the amount of slime after 3 days

Explanation:

The independent variable is the factor that is deliberately changed or manipulated in an experiment. Here, the choice between using coconut juice or water is what the experimenter is controlling.

Answer:

whether coconut juice or water was used