Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: It is actually the Yellow Christmas tree worm. These animals are colorful, and can be red, orange, yellow, blue, and white. The Christmas tree worm lives on tropical coral reefs throughout the world. The Christmas tree worm's plumes are used for feeding and respiration. These worms use their plumes to catch plankton and other small particles passing in the water. Cilia then pass the food to the worm's mouth. Answer: tropical coral reefs
Output:
Where does the christmas tree worm live?