instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: When heat is positive, the total energy of the system is increasing. Answer: it increases
answer:
What happens to the total energy of the system when heat is positive?

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

question:
Passage: What's the difference between monkeys and apes? The easiest way to distinguish monkeys from the other primates is to look for a tail. Most monkey species have tails, but no apes or humans do. Monkeys are much more like other mammals than apes and humans are. Answer: tail
answer:
What do most species of monkeys have that no apes or humans do?