A scientist is measuring dissolved oxygen levels in a lake over a period of one year. Which collection of samples would ensure consistency regarding these measurements?
A. samples from the same locations and at the same depths each week
B. samples from different locations and at different depths
C. samples from the same locations but at different depths each month
D. samples from different locations at the same depth and at the beginning and end of the year
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A scientist is measuring dissolved oxygen levels in a lake over a period of one year. Which collecti...
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