One-month-old Mari's grimace after tasting a substance suggests that what she tasted was

What is the biggest difference between the different stages of the sleep cycle?

A) Changes in physical activity B) Changes in respiratory effort C) Changes in muscle tone D) Changes in brain-wave activity

Zimbardo maintained that the Abu Ghraib fiasco was a product of _____

A) institutional forces B) situational forces C) propositional forces D) oppositional forces