iron is an important constituent of ____________
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Iron, which is the chief constituent of Earth's core, is the most abundant element in Earth as a whole (about 35 percent) and is relatively plentiful in the Sun and other stars
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Chlorophyll has magnesium as an important metal, haemoglobin has iron as its important constituent, amalgams are mixtures of something with mercury. Note that, silicon is the most abundant element in earth's crust
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