When drawing water from a large, well-mixed natural source, what is the probability that the water contains direct urine molecules?

Answer

Extremely low, approaching zero due to dilution over vast distances and time.

Due to the immense dilution that occurs in large natural sources like major river basins over long periods, the direct presence of specific molecules like urine components approaches zero probability.

When drawing water from a large, well-mixed natural source, what is the probability that the water contains direct urine molecules?
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