In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: What type of acid is often used as a preservative for acidic foods such as fruit juices? Answer: benzoic acid
Benzoic acid type of acid is often used as a preservative for acidic foods such as fruit juices.

Question: What type of behavior is most flexible? Answer: learned behavior
Learned behavior type of behavior is most flexible.

Question: The values of which factors are controlled by the experimenter over the course of an experiment? Answer: independent variables

The values of independent variables are controlled by the experimenter over the course of an experiment.