TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: If the experimental value is less than the accepted value, the error is negative. If the experimental value is larger than the accepted value, the error is positive. Often, error is reported as the absolute value of the difference in order to avoid the confusion of a negative error. The percent error is the absolute value of the error divided by the accepted value and multiplied by 100%. Answer: negative

SOLUTION: If the experimental value is less than the accepted value, the error is what?

PROBLEM: Passage: The cardiovascular system moves nutrients and other substances throughout the body. Answer: cardiovascular system

SOLUTION: Which human body system system moves nutrients and other substances throughout the body?

PROBLEM: Passage: Staying balanced when riding a scooter requires control over the body's muscles. The nervous system controls the muscles and maintains balance. Answer: nervous system

SOLUTION:
What helps control the muscles and maintain balance?