Zamboanguita, Negros Oriental, Philippines Kary Mar Flickr / Creative Commons
The corals and zooxanthellae have a mutualistic relationship. This means there is a positive relationship between two things and both benefit from the relationship. (National Oceanic and Atmospheric Administration)... when the zooxanthellae are under stress, such as high temperatures, they will die or leave their host—a process known as bleaching. (Smithsonian)
The Blue Planet
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