I apologize for any confusion in my previous response. To analyze the statements again, here is a review:
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The farm needs water for growing grass, but the zoo does not.
- This statement is correct, but it does not compare how both industries benefit water sources.
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The farm uses the water in the watershed for the cattle to drink. The zoo does not.
- This is also correct, but it emphasizes water usage rather than the impact on water sources.
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The wastes from the zoo are safer to add to the water than those from the farm.
- This could be true, but it's a specific claim that may not universally apply. It also does not focus on how they benefit water sources.
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Both the zoo and the farm get rid of wastes in a manner that does not involve water in the watershed.
- If true, this implies that both industries manage their waste responsibly, which could be seen as a way they both benefit the watershed by not polluting it.
Given this analysis, the last statement could be considered the most appropriate as it indicates that both organizations have practices that help maintain water quality in the watershed. However, it might not be explicitly clear without additional context on their waste management practices.
If you are looking for a definitive answer that emphasizes mutual benefits to the watershed, you may want to go with the last statement. Thank you for your patience!