Quote:
Originally Posted by Swift
An interesting question, and I don't know the answer. I wonder if it is a short-term versus long-term difference. In the short term, organisms that currently make carbonate shells can't adjust to the changing pH, but eventually ones that can evolve, and then procede to tie up more of the carbonate and make carbonate minerals.
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Keep in mind that carbonate rocks are made by more than just animals. They can be made just fine with no animals at all, which is why the earth is livable at all.