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yeah this is what i put i think, i think there was a past physics question i think that asked a similar thing about improving reliability and the correct answer was repeating it, even though it only really tests reliability

dunno what letter it was but it was the one with high turbidity & BOD and low pH, the cleared farmland would cause lots of erosion and their fertilizers would up the BOD, and decomposition of the organic matter would generate co2 and increase acidity