In the western U.S., bark beetle outbreaks have become much worse than in the past for all of the following reasons EXCEPT ________
A) catastrophic wildfires have resulted in the increased growth of the kinds of trees that the bark beetles prefer
B) warmer climate has resulted in increased reproductive output for the beetles
C) beetles are attacking the myriad even-aged forests throughout the West, which are the perfect age for infestation
D) milder winters caused by climate change are enabling beetles to spread northward
E) long-term droughts have stressed trees, making them vulnerable to attack
Answer: A
You might also like to view...
Oil shale and tar sands are examples of ________ oil.
A. Unconventional B. Unknown C. Unrecoverable D. Recoverable E. Unproven
Landslides and mudflows are two examples of rare and sudden types of mass movements
Indicate whether the statement is true or false.
Lower viscosity magmas will result in more explosive volcanic eruptions
a. True b. False Indicate whether the statement is true or false
How did this cone of depression in the groundwater form?
A. The earth's rotation causes groundwater to twirl in a counter-clockwise direction. B. Clay horizons cause perched water to flow away from a central point. C. Groundwater is pumped from the well faster than it can flow to replenish what is lost. D. An artesian spring flowed upward on all sides.