A researcher is investigating the impact of different levels of a specific nutrient on algal bloom density in a freshwater lake. Data was collected over a three-month period, with various levels of nutrient added to separate areas of the lake. The results are summarized in the table below:
Nutrient Level (mg/L) | Average Algal Density (cells/mL) |
---|---|
0 | 500 |
10 | 1500 |
20 | 3000 |
30 | 4500 |
Based on the data above, which nutrient level corresponds to the highest average algal density?