Many times, in social psychological research, it is often the case that when internal validity is high, there is a trade-off, and _________ is low

In those cognitive skills that are most closely related to work and daily living, the peak of performance usually occurs during:

a. adolescence b. emerging adulthood c. early adulthood d. middle adulthood

Which of the following kinds of play is characterized by the use of objects or materials by children to draw something or make something, such as a tower of blocks?

A) Functional play B) Symbolic play C) Constructive play D) Formal games