Changes in the heart and lungs that take place in young adulthood are likely not to be noticeable except during ________

The correlation between the combination of all predictors in a selection battery and the criterion is represented by:

A) multiple R. B) r2. C) r. D) y.

Among preschoolers, younger children's play is

A) more cognitively and socially mature in single-age classrooms than in mixed-aged classrooms. B) more cognitively and socially mature in mixed-age classrooms than in single-age classrooms. C) often characterized by competition and object assertion. D) often immature and functional, particularly for boys.