Approximately 13% of all bird species is threatened with extinction, mostly by ____.
A. disease
B. habitat loss
C. accidents during migration
D. hunting
E. use as pets
Answer: B
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The severity of a volcanic eruption depends most directly on the temperature of the molten rock that feeds the volcano.
Answer the following statement true (T) or false (F)
Russia still needs to modernize its dilapidated__________ if it is to compete economically against the European Union, North America or East Asia.
a. manufacturing base b. transportation system c. housing stock d. economy e. agricultural system
Obstacles to recycling include
a. lack of inclusion of environmental costs in market prices b. tax breaks for mining virgin materials c. lack of large, steady markets for recycled materials d. all of these answers e. none of these answers
How does a spatial join operation differ from a join operation?
What will be an ideal response?