On this graph of discharge versus season for a river in the Rocky Mountains, why is the highest runoff likely to be in the spring?
A. The Rocky Mountains have many tornadoes during the spring.
B. The Rocky Mountains experience hurricanes in the spring.
C. Winter snow melts in the spring.
D. All of these choices are correct.
Answer: C
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Two species of frogs do not interbreed because one species breeds in March and the other species breeds in May. This is an example of
A) allopatric speciation. B) sympatric speciation. C) a prezygotic reproductive barrier. D) a postzygotic reproductive barrier.
Natural causes of climate change include variation in
A) the concentration of atmospheric carbon dioxide. B) Earth's density. C) the amount of water in the hydrosphere. D) the concentration of atmospheric nitrogen.
What are dose-response curves, and what can they show?
What will be an ideal response?
In the ________ latitudes, more energy leaves the top of the atmosphere than is received during a year
What will be an ideal response?