The ecological efficiency of herbivores and carnivores is estimated by most authorities to be roughly:
a. 1 percent.
b. 10 percent.
c. 30 percent.
d. 90 percent.
B
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When wolves in the Yellowstone area in Wyoming were eliminated, the population of elk exploded and overgrazed the population of coyote willow shrubs that dominated the riverside ecosystems. Which type of species interaction was disrupted by the removal of the wolves?
A. predator-prey B. parasitism C. interspecific competition D. resource partitioning
President George W. Bush withdrew U.S. participation from the Kyoto Protocol, arguing that participation would harm the U.S. economy
Indicate whether the statement is true or false
The quickest and easiest way to save money on energy bills is to
A. Modify your energy-using behavior B. Put new insulation in your home C. Install a new furnace D. Buy a more efficient automobile E. Install a new water heater
Where in the U.S. would we find a Mediterranean climate?
A) south Florida B) Texas coast C) southern California D) none of these