how does carbon dioxide get into marine animal shells

Hello

I'm just preparing some material on the carbon cycle and I was wondering how marine animals get carbonate in their shells. Do they use carbon that they have eaten from plant life or they directly absorb the dissolved carbon dioxide in the water? Is there a specific name for the process, whatever it is?

Thanks
andiejeAsked:
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aburrCommented:
"how marine animals get carbonate in their shells"
The same way land snails (and other animals) do. They eat it
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