Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Unlike corals, jellyfish spend most of their lives as medusae. They live virtually everywhere in the ocean. They are typically carnivores. They prey on zooplankton, other invertebrates, and the eggs and larvae of fish. Answer: medusae
A:
Unlike corals, jellyfish spend most of their lives as what?