Final answer:
Corals and dinoflagellates have a mutualistic relationship where the dinoflagellates provide nutrients through photosynthesis and the corals protect and provide a habitat for them.
Step-by-step explanation:
The mutualistic relationship between corals and dinoflagellates is a symbiotic association in which both organisms benefit. The dinoflagellates, called zooxanthellae, live inside the coral polyps and provide nutrients through photosynthesis. In return, the corals protect and provide a habitat for the dinoflagellates.