Question

ecological impacts
an eastern nc pig farmer has been collecting the pig manure in a shallow
pond. when hurricane matthew came through, it dumped a lot of rain in the
area causing run-off of the manure. manure is waste from animals that is high
in nitrogen and phosphorus and these levels in the local water supply
increased dramatically following this event leading to eutrophication.
eutrophication is when the increased nitrogen in the water supply causes an
increase in algae population growth eventually overpopulating and then
crashing. this boom and bust of the plants in the water hurts the rest of the
ecosystem.
figure 1:
11 multiple choice 1 point
based on figures 1 and 2, do you think that the regulations on hog farming
have had a significant positive impact the amount of eutrophication in north
carolina waters
no, both nitrogen and phosphorous have significantly decreased
(more than 10%) which cancels out the effects of each so
eutrophication will stay the same.
yes, nitrogen levels have significantly decreased (more than 10%) so
eutrophication will significantly decrease.
yes, phosphorous levels have significantly decreased (more than 10%)
so eutrophication will significantly decrease.
no, phosphorous levels have not significantly decreased (more than
10%) so eutrophication will not significantly decrease

Explanation:

The text states eutrophication is driven by high nitrogen and phosphorus, with Figure 1 showing phosphorus levels have significantly decreased (more than 10%) while nitrogen remains elevated but the option focused on phosphorus's significant drop as the positive regulatory impact. This decrease in a key nutrient for algal growth will reduce eutrophication.

Answer:

Yes, Phosphorous levels have significantly decreased (more than 10%) so eutrophication will significantly decrease.