<span>The species would decrease in number and eventually die off. </span>
A coral reef is made of thin layers of calcium carbonate. Coral polyps form a living mat over a calcium carbonate skeleton. Stony corals (or scleractinians) are the corals primarily responsible for laying the foundations of, and building up, reef structures.
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The purpose of vesicles is simply water retention
I think the answer is Endospore. I'm sorry if I'm wrong...