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View Diary: Marine Life Series: Boring Sponges (40 comments)

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  •  carbonic anhydride - CO2 (0+ / 0-)

    forms calcium bicarbonate, which is more soluble than the carbonate. Same reaction as dissolves limestone, forming karst, caves, stalagmites, and stalactites.

    There could be other agents, as already suggested, but CO2 is 'free' to animals as a product of respiration.

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