According to Ainsworth's early research, how many toddlers overall were securely attached?

By the old-old years, what is a person's chance of having NO chronic diseases?

A) low B) fifty-fifty C) high D) excellent for someone who is upper-middle class

Rebecca was born in 1981 and Timmy was born in 1999. Which of the following is correct?

a. They are in the same birth cohort. b. They are in the same birth cohort but not the same generation. c. They are not in the same birth cohort or generation. d. They are not in the same birth cohort but they are in the same generation.