When the number of breeding animals within a species on an island is small, evolutionary change may be rapid through ____
A) ?favorable adaptations
B) ?natural selection
C) ?unfavorable mutations
D) ?physical isolation
D
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The resultant of a pair of equal-size vectors at right angles to each other is
A. ?2 the length of either vector. B. twice the length of either vector. C. equal to that of either vector. D. none of the above
In 1997, ecological economists put a price on the goods and services provided by natural systems. This estimated annual value ranged from
A. $16-54 thousand B. $16-54 billion C. $16-54 million D. $16-54 trillion E. $1600-$5400
Which association is incorrect?
A) mesocyclone — region of tornado formation B) tornado watch — a tornado has been sighted on the ground C) downdraft — precipitation D) anvil - front of the thunderstorm
What results following the evaporation of water that made up an oxbow lake landform adjacent to a meandering stream?
A. a cutoff meander B. an interfluve C. a yazoo stream D. a natural levee E. a meander scar