Given a scientific question, generate a correct answer to it.
--------
Question: The nervous system is characterized by electrical signals that are sent from one area to another. whether those areas are close or very far apart, the signal must travel along this?

Answer: axon

Question: What is the term for a loop in which a product feeds back to control its own production?

Answer: feedback mechanism

Question: What is formed when water vapor in the air condenses into tiny droplets?

Answer:
fog