Activities that are below one’s proximal development may cause the feeling of ______.

The wear-and-tear theory proposes that we age because new cells are imperfect copies of old ones

Indicate whether this statement is true or false.

The best definition of a case study is a study in which

A) there is a clear manipulation of an independent variable. B) information is gathered about one individual. C) non-human primates are used. D) many participants are followed for the majority of their lives. E) the dependent variable is measured over a large population.