What is the measure of side of AC?

Did the universe cool off or get hotter as it expanded after the 'big bang"?

What did pavlov initially notice about the animals in his original research after conditioning took place?

Which situation is the best example of opportunity cost? a country chooses to produce bananas instead of wheat. a country chooses to invest in manufacturing and agriculture. a country chooses to specialize in producing paper products. a country chooses to export all of its products.