Biology · ANIMAL KINGDOM

In Cnidarians exhibiting metagenesis (e.g., Obelia), how do the polyp and medusa body forms alternate during their life cycle?

1. Polyps produce medusae sexually, and medusae produce polyps asexually.
2. Polyps produce medusae asexually, and medusae form polyps sexually.
3. Medusae produce medusae asexually, and polyps form gametes.
4. Polyps produce polyps sexually, while medusae regenerate by fragmentation.