| http://www.w3.org/ns/prov#value | - tion, which comes partially from human emissions of greenhouse gases, including carbon dioxide from burning fossil fuels that dissolves into acid, makes it harder for creatures to extract calcium carbonate, which forms their skeletons and shells.According to the Mother Nature Network, the research team tested four types of shell-building marine animals ??? clams, sea snails, lampshells and sea urc
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