Which of the following human activities generates the most carbon dioxide?a. driving;b. cooking;c. bathing;d. using aerosol sprays

Movement corridors area. the routes taken by migratory animals.b. strips or clumps of habitat that connect isolated fragments of habitat.c. landscapes that include several different ecosystems.d. edges, or boundaries, between ecosystems.

Biologists claim that the all-taxa survey now under way at the Great Smoky Mountains National Park in the United States will improve their ability to estimate the total number of species living today. Discuss the benefits and limitations that this data set will provide in understanding the extent of global biodiversity.

With limited resources, conservation biologists need to prioritize their efforts. Of the following choices, which should receive the greatest attention for the goal of conserving biodiversity?a. a commercially important speciesb. all endangered vertebrate speciesc. a declining keystone species in a communityd. all endangered species

Some biologists prefer to focus efforts on preserving endangered species while others prefer to focus on preserving ecosystems. What is your advice to biologists, based on the evidence from this chapter?

Which of the following statements about protected areas is not correct?a. We now protect 25% of the land areas of the planet.b. National parks are only one type of protected area.c. Most reserves are smaller in size than the ranges of some of the species they are meant to protect.d. Management of protected areas must coordinate with the management of lands outside the protected zone.

Explain why the construction of wildlife corridors can help maintain genetic diversity in a fragmented landscape.

What are the three levels of biological diversity? Explain how human activities threaten each of these levels.

What is rapid eutrophication? What steps might be taken to slow this process?