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Positive ions present in living beings

Name the main positive ions present in living beings?

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The main cations found in living-beings are the potassium cation (K+), the sodium cation (Na+), the calcium cation (Ca++), the magnesium cation (Mg++), the iron cations (Fe++, Fe+++), the zinc cation (Zn++) and the manganese cation (Mn++).

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