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Gardeners take crushed shells from the sea to put calcium into the soil. But where do shellfish get their calcium from? If we took calcium from the sea in large enough quantities, would shellfish be shell-less?

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Gardeners take crushed shells from the sea to put calcium into the soil. But where do shellfish get their calcium from? If we took calcium from the sea in large enough quantities, would shellfish be shell-less?	1
What is the relative methane production of dairy and meat animals vs decomposition of plant based matter?	1