noun
a type of algae that lives symbiotically within the tissues of certain marine animals, such as corals
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Zooxanthellae are photosynthetic algae that live in symbiosis with coral reefs.
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The zooxanthellae help the coral reefs by providing them with nutrients.
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The coral reefs and zooxanthellae are like best buds, always looking out for each other.
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The zooxanthellae are the lifeblood of the coral reefs, keeping them vibrant and healthy.