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Kim’s research project manipulated the pH of water in three aquariums that contained sea urchins. Which of the following BEST describes what Kim measured to determine the pH level of the water in the aquariums?

A. the activity of hydrogen ions in the water
B. the temperature of the water
C. the cloudiness of the water
D. the dissolved oxygen in the water

1 answer

A. the activity of hydrogen ions in the water
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