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Corals produce a calcified mineral exoskeleton that is white in appearance. Dead coral from thousands of years ago is dug up in the ground, crushed, and sold as a healthy calcium supplement for humans and animals. Corals are symbiotic with Algeas that give brilliant colors on top of the exoskeleton. They need one another to survive. Recently higher water temperatures have been killing the algaes, leading to the phenonmenon known as coral bleaching. In time, the bleached corals also die. This is a threat to the entire reef ecosystem and has repercussions across all marine ecosystems and perhaps the entire world ecosystem.

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17y ago

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