Zooxanthellae live within the tissues of corals and both organisms benefit from the association.This is known as:

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Mutualism refers to the relationship between two species in which both benefit from the association. In the case of corals and zooxanthellae, the corals provide a protected environment and nutrients for the zooxanthellae while the zooxanthellae provide oxygen and organic carbon for the coral through photosynthesis. Therefore, this relationship is an example of mutualism.

Zooxanthellae Live Within the Tissues of Corals and Both Organisms