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devan_wise devan_wise
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9 years ago
A) iron
B) sodium and potassium
C) oxygen (O2)
D) calcium
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wrote...
Donated
9 years ago
The question is cut off but i deduce the answer will be B) Sodium and Potassium, because those ions are used everywhere.
Success is not final, failure is not fatal: it is the courage to continue that counts. – Winston Churchill
wrote...
9 years ago
Essential for....?
devan_wise Author
wrote...
9 years ago
thank you!
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