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I think the answer is letter b. multivitamins. As what I have read about supplements it include vitamins and minerals and substances which come from a natural source. And also because of this substances it helps the human body maintain its well-being.
Answer: correct answer is “changing”
Explanation:
Your answer would be, I believe, Billion gallons per day, Because, the independent quantity is time in days, and the dependent quantity is volume of water in billions. (Flow Rate: 84,760 Cubic Feet Per Second.).
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