For coral reefs to form in tropical waters, it is necessary for the coral animals to live in symbiosis with:

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Coral reefs form in tropical waters through a symbiotic relationship between coral animals and zooxanthellae, which are photosynthetic algae. These algae live within the coral tissues, providing the corals with glucose, glycerol, and amino acids, which are the products of photosynthesis, necessary for the coral to grow and build reefs.

For Coral Reefs to Form in Tropical Waters, It Is