Hello there!
The correct answer is A:
State governments tend to be more responsive to social movements than the federal government because they are able to test out new programs on a smaller scale.
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~Garebear
Answer:B (I am not sure)
Explanation:
The cold periods are called glacials (ice covering) and the warm periods are called interglacials. There were at least 17 cycles between glacial and interglacial periods.