The primary mandate of the Clean Air Act of 1970 was to require:  

All of the following are characteristics of high-density animal farming (aka CAFO’s) EXCEPT…

What occurs during El Niño?

Which of the following is an example of a natural disruption that can significantly alter an ecosystem?  

Which of the following is associated with a transform boundary?

A company is importing rare tropical hardwood to manufacture furniture, which did they violate? 

 The net primary productivity (NPP) of an ecosystem is 25 kg C/m2/year, and the energy needed by the producers for their own respiration is 30 kg C/m2/year. The gross primary productivity (GPP) of such an ecosystem would be…  (kilograms of carbon serves as a proxy for kcal in this case) 5 kg C/m2/year. c)  25 kg C/m2/year.. 10 kg C/m2/year. d)  55 kg C/m2/year.

How are global wind patterns most likely to be affected by the ongoing rise in global temperatures due to climate change?  

Which soil horizon is predominantly composed of organic matter in various stages of decomposition?  

The American whooping crane and the California condor are two of North America’s largest birds. Although both are rare and endangered, they are protected, and large preserves are available for them. The two species, however, seem to be responding differently to these conservation efforts.        In 1937, the whooping crane population was reduced to 14 individuals. It has since recovered; currently more than 200 birds live and breed in the wild. In the preservation of endangered species, the whooping crane is a success story. On the other hand, the California condor population declined rapidly so that no birds remained in the wild between 1987 and 1992. Condors were reintroduced into the wild after 1992 and approximately 50 condors currently live in the wild in California and Arizona. However, the recovery program cannot yet be considered a success.  (a)  Identify and describe TWO major causes for the original decline of these species. (You may describe one cause for each species or two causes for one species.) (b)  Describe TWO measures that have been taken to protect these species. (Specify which of the species benefited from each measure.)  (c)  Describe TWO important characteristics of an endangered species that would cause it to be slow to recover. (d)  Make one economic or ecological argument for protecting the condor, the whooping crane, or another endangered species that you identify and make one economic or ecological argument against protecting it.