The soil horizon containing only organic material is the
A. A horizon
B. B horizon
C. C horizon
D. O horizon
E. E horizon
Answer: D
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Most tourists to Southeast Asia arrive from:
A) Australia B) Europe C) China D) other Southeast Asian countries
Biologists define a region as a biodiversity hotspot if ________
A) volcanic eruptions threaten species living in the area B) there is an exceptionally high level of species diversity and endemism C) there is an endemic species protected by a captive breeding program D) there is at least one umbrella species to be protected
Valleys in karst topography are generally small and ________
Fill in the blank(s) with the appropriate word(s).
The phylogenetic species concept holds that the definition of a species should be
A. based on branching relationships among species. B. based on reproductive compatibility. C. based on evolutionary relationships. D. variable depending on the type of organism.