Dawn is a graduate student investigating the development of fine motor skills. She selects one group of children and assesses their fine motor skills every six months over a six-year period. In this example, Dawn is using a __________ research design

Studies indicate that __________ tend to value monogamy more highly than other couples

a) cohabitating couples b) gay couples c) lesbian couples d) unmarried couples

Felicity and Samantha are identical twins. They are

A) probably both right-handed. B) more likely than ordinary siblings to differ in hand preference. C) probably both left-handed. D) less likely than fraternal twins to differ in hand preference.