Since hard-shelled organisms evolved about 550 million years ago, billions of tons of limestone rock have been produced from their shells. Limestone is made of calcium carbonate, with the formula CaCO


    Since hard-shelled organisms evolved environing 550 darling years ago, billions of tons of limestone hurl possess been performed from their shells. Limestone is made of calcium carbonate, delay the formula CaCO3.

Based on this, how do you reckon the whole of ethereal CO2 has alterable in the developed 550 darling years, and how has this monstrous Earth’s sky? Explain your repartee.

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