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I don't think that any of them would have an advantage over corals when it comes to building reefs. Perhaps they could manage to build some, but it would be hard. Echinoderms Coral create coral r...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:45Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/21501 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/