Question

copy of eutrophication: algal blooms from excess nutrients
individual assignment progress: 15/20 answered score: 9 / 19 (47.37%)
identify the time of the year when nitrates in this river are at their highest levels.
late summer and fall
winter
spring and early summer

Explanation:

By observing the graph, the highest points of the nitrate - level curve occur around May - June 2023, which is spring and early summer.

Answer:

Spring and early summer