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rockabye rockabye
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6 years ago
Periods of R sleep alternate with periods of N sleep in a cycle that recurs about every ________ minutes or so.
A) 210      B) 60      C) 5      D) 90
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Psychology

Psychology


Edition: 2nd
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OmarianOmarian
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rockabye Author
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6 years ago
You make an excellent tutor!
ethom947
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sakoon
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2 hours ago
Smart ... Thanks!
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