Deven Case

Biology

23 September, 15:33

The fish in a pond are dying because of algal bloom. Algal bloom is caused by the presence of excess phosphorus or sulfur in the pond. An investigation into the matter indicates that chemical fertilizers made in a factory nearby are responsible for the presence of these chemicals in water. Under what conditions might this data be considered biased?

A)

If there are no other possible sources of fertilizers near the pond.

B)

If other living organisms in the pond were also dying along with the fish.

C)

If the farms nearby use organic fertilizers rather than chemical fertilizers.

D)

If the farms nearby use chemical fertilizers that could be washed into the pond.