In contrast to Earth’s past mass extinctions, what is the cause of current extinctions?
A. decreased insolation
B. human activity
C. tectonic shifts
D. climate change
E. species competition
B
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How is it possible to deduce the identity of an element from its electron configuration?
A. Using the periodic table, the outermost occupied shell indicates the group while the number of occupied shells indicates the period. B. If the atom is electrically neutral, the number of electrons corresponds to the atom's atomic number. C. The number of occupied shells corresponds to the atom's atomic number. D. An electron configuration is unique to each element, much like its atomic spectrum.
For the urban geographer, urban areas are part of both an economy and a society
Indicate whether this statement is true or false.
Groundwater mining
A. lowers the water table. B. creates perched water tables. C. reduces the zone of aeration. D. digs out the water instead of pumping it.
According to ____ Rule, the body size of warm-blooded subspecies usually increases with decreasing mean annual temperature of its habitat
a. Allen's b. Krummholz's c. Bergmann's d. the Generalist e. the Specialist