Question

logical impacts
eastern nc pig farmer has been collecting the pig manure in a shallow
d. when hurricane matthew came through, it dumped a lot of rain in the
ea causing run-off of the manure. manure is waste from animals that is high
nitrogen and phosphorus and these levels in the local water supply
creased dramatically following this event leading to eutrophication.
utrophication is when the increased nitrogen in the water supply causes an
crease 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:
12 multiple choice 1 point
which of the following describes why eutrophication is harmful to an
ecosystem?
increased algae in the water increases the oxygen as well, leading to
more fish in the area
additional nitrogen in water makes it healthier for humans, so it will
be used as drinking water instead of supporting marine life
by adding in nitrogen and algae, water becomes more healthy for
many species, increasing biodiversity
increased algae and reduced oxygen in the water causes many species
to die, resulting in reduced biodiversity

Explanation:

Eutrophication occurs when excess nitrogen/phosphorus cause algal blooms. When the algae die and decompose, oxygen in the water is depleted. This low oxygen level kills aquatic species, reducing overall biodiversity. The other options are incorrect: increased algae does not raise oxygen, excess nitrogen makes water unsafe for drinking, and eutrophication reduces rather than increases ecosystem health.

Answer:

D. Increased algae and reduced oxygen in the water causes many species to die, resulting in reduced biodiversity