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Summary of Mean Water Quality Results

\begin{tabular}{|c|c|c|c|}
\hline Water Quality Parameter & Green Roof Mean & Control Roof Mean & Precipitation Mean \\
\hline pH & 7.28 & 6.27 & 4.82 \\
\hline Nitrate ( [tex]$mg/L$[/tex] ) & 0.27 & 0.87 & 0.6 \\
\hline Ammonium ( [tex]$mg/L$[/tex] ) & 0.85 & 1.47 & 1.19 \\
\hline Total Phosphorus ( [tex]$mg/L$[/tex] ) & 0.47 & 0.25 & 0.21 \\
\hline Magnesium ( [tex]$mg/L$[/tex] ) & 2.92 & 0.25 & 0.20 \\
\hline [tex]$\operatorname{BOD}$[/tex] ( [tex]$mg/L$[/tex] ) & [tex]$0 \div 0$[/tex] & 0.03 & 0.00 \\
\hline
\end{tabular}

Which of the following statements is best supported by the data shown in the table?

A. Passage of rainwater through the green roofs increased the acidity of the water from the increased formation of carbonic acid.

B. Green roofs reduced levels of ammonium because the vegetation absorbed the pollutant.

C. Green roofs are effective at removing all pollutants from rainwater because the plants can absorb the toxins from the precipitation.



Answer :

GinnyAnswer
Let's analyze the provided data from the table and determine which statements are best supported by the data.

The table provides mean levels for various water quality parameters for Green Roof, Control Roof, and Precipitation. We consider the following parameters: pH level and ammonium concentration because they are directly referenced in the given statements.

1. Statement (A): Passage of rainwater through the green roofs increased the acidity of the water from the increased formation of carbonic acid.

- Precipitation pH: 4.82
- Green Roof pH: 6.27

Interpretation: Acidity is associated with lower pH values. Comparing the pH from green roof and precipitation, we see that the green roof pH (6.27) is higher than the precipitation pH (4.82). This indicates that the passage of rainwater through the green roofs actually reduced the acidity, rather than increased it.

Therefore, Statement (A) is not supported by the data.

2. Statement (B): Green roofs reduced levels of ammonium because the vegetation absorbed the pollutant.

- Precipitation Ammonium: 1.19 mg/L
- Green Roof Ammonium: 1.47 mg/L

Interpretation: Comparing the ammonium levels, we see that the concentration in the green roof water (1.47 mg/L) is higher than that in the precipitation (1.19 mg/L). This implies that the green roofs did not reduce the ammonium levels.

Therefore, Statement (B) is not supported by the data.

3. Statement (C): Green roofs are effective at removing all pollutants from rainwater because the plants can absorb the toxins from the precipitation.

Interpretation: Since the green roof water still contains significant levels of pollutants such as ammonium, as demonstrated in the data, it is clear that green roofs do not remove all pollutants.

Therefore, Statement (C) is not supported by the data.

Conclusion:
None of the statements (A), (B), or (C) are supported by the data provided in the table. Thus, the best-supported statements by the data are:

- Statement (A): 0 (not supported)
- Statement (B): 0 (not supported)
- Statement (C): 0 (not supported)

So, the final result is (0, 0, 0).

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