In general, humans can harvest renewable resources of plants and animals at sustainable levels because
A) ecosystems continue to change with new species replacing those that have been harvested.
B) new species are always evolving to take the place of those that are harvested.
C) organisms naturally produce many more offspring than are needed to maintain their populations.
D) people naturally harvest organisms only after they have had a chance to reproduce.
Question 2
According to the latest government models for predictions of temperature increases in the US, in 40 years the Chicago, Illinois climate will change to be most like the current climate in
A) St. Louis, Missouri.
B) Lincoln, Nebraska.
C) Cincinnati, Ohio.
D) Iowa City, Iowa.
