Exam 48: Human Impacts on the Biosphere

A species that has population levels so low it faces extinction in all or part of its range is designated as ____.  

Which type of species is most likely to go extinct?  

For the purposes of conservation,a species is considered __________ in the wild if the only known members of the species are in captivity.

Practices such ranchers allowing their livestock to overgraze grasslands contribute to ________________ of the habitat.  

Choose the one most appropriate answer for each. -Threatened species

A region's biodiversity is measured at three levels: _____ within species,_______diversity,and _______diversity.

In the United States,solid municipal waste can no longer be dumped ____.  

A lifestyle that meets the needs of the present generation without reducing the ability of future generations to meet their own needs is referred to as _______ living.

The increased acidity of seawater can harm marine life by making ____ available to organisms that require it.  

One way in which deforestation contributes to global climate change is that the conversion of forest to cropland or pasture ____.  

Choose the one most appropriate answer for each. -Endemic

Where does the copper used for wiring and plumbing come from?  

When a forest is cut down,daytime temperatures rise and reduced __________ results in less rainfall.

Of all the species that have ever lived on Earth,how many have gone extinct?  

Answer the following questions in reference to the four geologic periods listed below. -Human practices are the major agents of extinction.

Choose the one most appropriate answer for each. -Endangered species

In 1987,countries worldwide agreed to phase the production of ____________,once a major ozone destroyer,to reduce ozone layer thinning.

The release of most nitrogen oxides comes from ____.  

Which of the following is least likely to be a cause of extinction?  

Work done in Louisiana's coastal wetlands is an example of ____.