Coral have a symbiotic relationship with what in order to eat?

Most have a symbiotic relationship with photosynthetic algae, called zooxanthellae.

The corals have a relationship with algae (called zooxanthellae) that live in the tissues of the corals. The coral provides protection for the algae and the algae provides the coral with the compounds they need for photosynthesis

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the answer is b. glad to .