MARKING BRIANLIST WORTH 50

Burntside Lake near Ely has a phosphorus content of 9 parts per billion. Albert Lea Lake has a phosphorus content of 242 parts per billion. What lake would you be able to catch more healthy fish in?
A) Albert Lea Lake
B) Burntside Lake
C) Neither lake has fish

Walleye fish have a dissolved oxygen requirement of at least 4.5 parts per million. In the past, a lake near you fell below that and most of the walleye population died. You are now studying a lake in central Canada with a healthy walleye population. A farm started operating next to this lake this year. The lake's dissolved oxygen levels are dropping. What can you assume will happen?
A) If the dissolved oxygen levels fall below 4.5, we don't know what will happen to the fish.
B) If the dissolved oxygen levels fall below 4.5 there won't be an effect on the walleye because Canadian walleye are more hardy.
C) If the dissolved oxygen levels fall below 4.5, most of the walleye population will die.

A big farming company wants to build a group of farms near a clean group of lakes. They claim that no damage will be done to the ecosystem because tubeworms are the main source of food for the other creatures, and tube worms can survive with almost no dissolved oxygen. What is wrong with this claim?
A) They didn't mention the dissolved oxygen requirements for the other aquatic creatures.
B) Nothing. Their claim is correct.
C) They were too specific in their response
D) None of the above

Algae lake is surrounded by farmland and is in pretty bad shape. As a conservation biologist working for the DNR, you have already measured the lake's dissolved oxygen and nutrient levels and have found that the lake cannot support a healthy fish population. Your goal is to improve the health of the fish population. What would be the next appropriate step to take?
A) Immediately stock the lake with more fish
B) Find all of the invasive species and eliminate them
C) Report your findings to the farmer(s) and discuss ways to limit fertilizer runoff into the lake.