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The Great Barrier Reef was formed by nature, with hundreds of years of living coral building upon the skeletons of other coral.

The corals that build reefs are not single animals. Coral is made up of colonies comprised of many individual animals called polyps, which join together. Coral polyps are a little like sea anemones, having tentacles that extend outwards, but they are not actually anemones.

Corals which create coral reefs have a symbiotic relationship with algae known as zooxanthellae. This algae, which lives within the tissues of the coral, causes a photosynthetic reaction which enables the polyps to make skeletons about three times faster in the light than in the dark. This means the corals deposit skeletons faster than the environment can remove it, and these skeletons build upon each other over time, creating a coral reef.

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