Given a scientific question, generate a correct answer to it.

Example Input: Ultimately, the fluid that is lost from the blood vessels is returned through what system?
Example Output: lymphatic

Example Input: What is the period during which humans become sexually mature called?
Example Output: puberty

Example Input: Bioluminescence is an example of what type of activity that is carried out by a cell and is precisely coordinated and controlled?
Example Output:
metabolic