If the information is posted without a specific source, you are least likely to feel that an Internet source is reliable.
Answer: d. Sodium
Explanation:
Sodium (Na), has atomic number 11, it makes up 2.8% of Earth's crust by weight and 0.2% of the human body by weight. It is the principal positive ion outside cells, has an essential role in maintaining water balance inside the cells, important in nerve function, and blood pressure regulation when combined with potassium.
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