The leading suspected environmental source of the asthma epidemic among children living in substandard housing is ________.

Which of the following is a characteristic of N3, or slow-wave sleep?

a) people are seldom aware they were asleep if awakened b) people typically experience hypnic jerks of the muscles c) it is the deepest level of sleep d) it is when the majority of our dreams occur

The ________ approach to classroom learning designed by Aronson and his colleagues takes advantage of the six principles of effective contact between groups

A) co-dependent B) jigsaw C) interactive D) mutuality