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
B
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Gravitational attraction by Earth on a gliding bird pulls it downward. The reaction to this downward force is
A. the bird pulling Earth upward. B. the bird's attraction to Earth. C. air resistance by the bird on the air. D. all of the above E. none of the above
Compared to the United States, poor families in European cities are more likely to be
A) clustered in inner-city neighborhoods. B) dispersed throughout the city. C) clustered in suburbs. D) distributed uniformly in the city. E) living along major boulevards.
Secondary control on the proliferation of T cells is provided by which of the following?
A) tyrosine kinase activation B) phosphatase deactivation C) both a and b D) neither a nor b
What is the feature numbered 2 in the upper left part of this figure?
A. U-shaped valley B. terminal moraine C. cirque D. lateral moraine