A) lipids
B) biological fluids
C) fats
D) enzymes
Correct Answer: B
Solution :
Na, K, Mg and Ca are vital elements. Their ions are present in biological (body) fluids. \[\text{N}{{\text{a}}^{\text{+}}}\]and\[\text{C}{{\text{a}}^{\text{2+}}}\]ions are present mainly in extracellular region (outside the cell). On the other hand,\[{{\text{K}}^{+}}\]and \[\text{M}{{\text{g}}^{\text{2+}}}\]ions are found inside the animal cells.
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