Which mineral property is the least reliable for identifying a mineral?

A) cleavage
B) luster
C) crystal form
D) streak
E) color

Which term describes the relationship between fire ant and native ant populations? 

A)  mutualism 
B)  interspecific competition 
C)  commensalisms 
D)  intraspecific competition

In which biome would a small burrow-dwelling animal with thick fur live? 

A)  desert 
B)  arctic tundra 
C)  tropical forest 
D)  temperate grassland

What percentage of freshwater fish are at risk of becoming extinct in the near future? 

A)  65% 
B)  37% 
C)  16% 
D)  5%

What is the most feasible immediate option for addressing global energy issues? 

A)  Increase efforts to develop breeder nuclear fission and nuclear fusion. 
B)  Build more and better conventional nuclear power plants. 
C)  Find and burn more forms of oil, natural gas, and coal. 
D)  Reduce unnecessary energy waste by improving energy efficiency.

Which stage will have death rates that fall while birth rates remain high,according to the demographic transition model? 

A)  the postindustrial stage 
B)  the industrial stage 
C)  the preindustrial stage 
D)  the transitional stage