Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: Any magnet has two ends called poles where the magnetic effect is strongest. Answer: poles
Example Output: What do you call the two ends of a magnet where the magnetic effect is strongest?

Example Input: Passage: Improving crops by selecting for certain genetic traits. The desired traits promote productivity. Recently, genetically engineered crops have been introduced. Answer: promotes productivity
Example Output: What is the advantage of selecting for certain genetic traits for crops?

Example Input: Passage: Zappy's. Plankton, nekton, and benthos are the three groups of living things in the oceans . CC BY-NC 3.0. Answer: in the oceans
Example Output:
Where do plankton, nekton, and benthos live?