In the summer, vast areas of the tundra are covered by lakes, ponds, and wetlands that are critical nesting sites for migratory birds. Which of the following best explains why this happens?
A. Permafrost prevents drainage of water.
B. Dense clay layers prevent drainage of water.
C. There is no river for the snowmelt to drain toward.
D. Continual rain keeps the land saturated.
Answer: A
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