Question

with more businesses and homes being built along the great lakes as well as an increase in boating, the pollution entering the lakes has increased. the native fish of the great lakes have been slowly decreasing in population because of pollution and over - fishing. the population decline hurts those who fish commercially and decreases money entering the state economy. students in a biology class have decided to run a simulation to see what could happen to the population of native fish in the great lakes if pollution was decreased. they found information on the approximate populations of native fish in the great lakes and current levels of various toxins. they used those values and decreased the levels of toxins to see what would happen to the populations of native fish. instead of the population of native fish increasing, the populations of native fish declined even more. what revision could the students probably make to their simulation to achieve their desired result of increasing native fish populations? a. introduce a different toxin into the lakes b. decrease the number of invasive species in the lakes c. decrease the temperature of the lakes d. increase the number of native fish caught by fisherman

Explanation:

Invasive species can compete with native fish for resources like food and habitat, leading to a decline in native - fish populations. Decreasing the number of invasive species would likely reduce this competition and could help increase native fish populations. Introducing a different toxin (A) would likely harm native fish further. Changing the lake temperature (C) may not directly lead to an increase in native fish populations as native fish are adapted to the current temperature range. Increasing the number of native fish caught by fishermen (D) would decrease, not increase, native fish populations.

Answer:

B. decrease the number of invasive species in the lakes