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

Example Input: Passage: Are you on the basketball team? Are you a cheerleader? Do you play an instrument in the band? Your niche would be your role or place in the school. Organisms also each have their own niche in the ecosystem. Is an organism a producer or a consumer? How does the organism interact with other organisms? Is the organism involved in any symbiotic relationships?. Answer: niche
Example Output: An organism's unique role in the ecosystem is called its what?

Example Input: Passage: The male gametophyte produces flagellated sperm that must swim to the egg formed by the female gametophyte. For this reason, sexual reproduction must happen in the presence of water. Therefore, nonvascular plants tend to live in moist environments. Though the life of a nonvascular seedless plant is a cycle, this can be considered the initial step in the life cycle. Answer: water
Example Output: When flagellated sperm must swim to the egg, sexual reproduction requires the presence of what substance?

Example Input: Passage: Adult sea stars and other echinoderms have obvious radial symmetry. What evidence supports the claim that echinoderms evolved from an ancestor with bilateral symmetry?. Answer: radial symmetry
Example Output:
Adult sea stars have what kind of symmetry?