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

Ex Input:
Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called what?

Ex Output:
coral reefs

Ex Input:
What does the megaspore mother cell produce after meiosis division?

Ex Output:
four haploid megaspores

Ex Input:
What helps frogs swim during the tadpole phase?

Ex Output:
a tail