When cohabiting couples do marry, their marriages involve greater commitment and are less likely to end in divorce, compared to couples who marry without cohabiting first

Researchers secretly dabbed a red spot on the nose of babies of different ages and then placed them in front of a mirror. They were testing ______________

a. expressive language ability b. short-term memory c. self-recognition d. gender identity

Skeletal age is measured by determining

A) muscle and bone strength. B) the length of the long bones. C) the extent to which cartilage has hardened into bone. D) joint flexibility.