The beautiful color of corals in the ocean comes from the algae living with them  Among them, zooxanthellae is the most important kind of single-cell algae  They take their own needs and want to provide food for each other  The sea water warming caused by global warming leads to a large number of deaths of zooxanthellae and other algae, which leads to the death of corals themselves and the bleaching of coral reefs
Some zooxanthellae gradually adapt to the increase of sea water temperature and survive
 However, the study found that, Coral can cope with the challenge of climate warming by selecting other heat - resistant algae