Answer :
Based on the relationships described:
1. Zooxanthellae and hard coral: Mutualism. Zooxanthellae live inside the tissues of hard corals, providing them with essential nutrients through photosynthesis, while the coral offers protection and a habitat for the zooxanthellae.
2. Remora and manta ray: Commensalism. Remoras attach themselves to manta rays using a suction disc on their head, gaining protection and transportation benefits without significantly impacting the manta ray.
3. Tiger shark and green sea turtle: Predation. Tiger sharks prey on green sea turtles as part of their diet, illustrating a predator-prey relationship.
4. Dolphin and school of trevallies: Mutualism. Dolphins work cooperatively with schools of trevallies to herd and catch fish, benefiting both species through increased hunting success.