How many times does REM sleep generally occur during the average sleep? 1-2 times
3-4 times
5-7 times
9-11 times

How were the economies of the northern and southern states different? how ere they the same? what factors led them to develop differently?

What was the midwest states often called because they were located in the center of the nation

Because of the housing bubble, many houses are now selling for much less than their selling price just two to three years ago. there is evidence that homeowners with virtually identical houses tend to ask for more if they paid more for the house. what fallacy are they making?