In a watershed, why would the water be cleaner near the top where it just rained as oppose to the bottom where the water collected?

In a watershed, why would the water be cleaner near the top where it just rained as oppose to the bottom where the water collected?

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  1. Well i had the same answer, so the correct answer would be a. but in this case it would be the one with plasma membrane and cell wall circled that is next to the hairy pill type of thing.

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