Most ecologists now recognize that mature, late-successional ecosystems ____.
A. are in a state of continual disturbance and change
B. are in a stable state of equilibrium
C. are in natural balance with their environment
D. have followed an expected path to their stable state as a climax community
E. have inevitably progressed through succession and no longer face competition
Answer: A
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Which of the following locations would have the lowest specific humidity?
A. A B. B C. C D. D
The most common problem encountered by seabirds coated with oil is ____.
A. immediate death B. vulnerability to predators C. loss of buoyancy and insulation, causing deaths from drowning or loss of body heat D. poisoning by taking in the oil internally E. starvation
Geographer and historian William Cronon argues that settlers leaving Chicago would encounter which of the following economic land use activities sequences as they traveled further westward?
A. dairies, corn and wheat, orchards, garden markets, ranching, trapping, wilderness B. wilderness, trapping, ranching, orchards, corn and wheat, orchards, garden markets, dairy C. dairies, garden markets, orchards, corn and wheat, ranching, trapping, wilderness D. orchards, dairies, corn and wheat, garden markets, ranching, trapping, wilderness
The pollution that causes acid deposition can cross national boundaries.
Answer the following statement true (T) or false (F)