The two graphs shown below represent data collected from the same lake over a 20-year period. Over the course of the 20-year period, the oxygen
content of the water was measured, as well as the presence of E. coli found
in sewage waste. During the same time period, the population sizes of
varying fish species were also monitored.
Oxygen Content and Fish Population in a Lake
Oxygen
Carp
Sewage
Waste
Amount of
Specific Substances
Relative
Quanity
of Fish
Trout
Walleye
1950 1955 1960 1965 1970
Whitefish
1950 1955 1960 1965 1970
Which of the following is the most likely relationship implied by the data
collected during the monitoring period?
A. The walleye population increases as sewage levels increase.
B. The whitefish population increases as oxygen levels decrease.
O C. The trout population decreases as oxygen levels decrease.
O D. The carp population decreases as sewage levels increase.