Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Many sponges live on coral reefs, like the one in Figure below . Reef sponges typically have symbiotic relationships with other reef species. For example, the sponges provide shelter for algae, shrimp, and crabs. In return, they get nutrients from the metabolism of the organisms they shelter. Answer: symbiotic
A:
Reef sponges typically have what type of beneficial relationships with other reef species?