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They take magnesium.
Conch shells, like most all shells, are formed biologically by gastropods. The process happens through the absorption of calcium carbonate from seawater.
Life on Earth is carbon based, so all animals with skeletons and shells use carbon. A more 'common' element used in skeletons and shells is calcium.
limestone
Growing plants Chemical geological processes (happening in the Oceans). Organisms that make calcite shells (that then become buried by geological processes).
No. Limestone is usually formed from the shells of marine animals or calcite precipitates from seawater.
Limestone fits the description given.
As the ocean takes up CO2 that means that the mussel's who live in the ocean take up some of the carbon dioxide in to there shells.
No, carbon has 4 valence electrons.
Carbon from burning fuels is released as carbon dioxide. The carbon dioxides is either absorbed in seawater and converted to sea shells or plankton, or absorbed by plants and convrted to sugars. Plant matter (both in the ocean and on land is eaten to become animal flesh or is used for energy and reconverted to carbon dioxide. Some plant matter (trees) is used as renewable fuels and converted to carbon dioxide. The carbon taken out of the system for the longest time becomes limestone or fossil fuels.
chemical change
carbon is an element, so "carbon" can't exist of anything. But the carbon found in fossil fuels are mostly from shells and dead animals or plants, after being exposed to imense heat and presure by stacking layers of sediment, plants and shells