The continental ice sheets over North America disappeared ____
a. between about 9,000 and 6,000 years ago
b. approximately 14,700 years ago
c. about 2.5 million years ago
d. between about 5,000 and 4,000 years ago
e. about 1300 years ago
ANSWER: a
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Answer the following statement true (T) or false (F)
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