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Which gases block the ozone layer of the earth? The hydronium ion concentration in an aqueous solution at 25 C is 6.1 × 10-2 M. What is the hydroxide ion concentration in this solution? What is the bundle of nerves that forms a simple brain called? The sum of the squares of two consecutive off integers is 74. Find the two integers? How do I solve f(x+3) when f(x) = 4-x^2?