The leading cause of death among 15- to 24-year-olds is

Adaris has always been drawn to the saying "Absence makes the heart grow fonder," and she decides to incorporate this saying into her research project

Adaris is trying to define absence in a way that can be empirically tested. She is attempting to find an appropriate __________ a) hypothesis. b) operational definition. c) double-blind study. d) theory.

Baby Kataro frequently experiences joint attention. This means that he will probably

A) have a short attention span. B) be a late talker. C) produce meaningful words earlier. D) comprehend less language.