Psychology is a complete text with more than 550 study questions providing interaction on every page. Two dozen investigations incorporate more than 70 videos, journal articles, infographics, and primary sources.

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Investigation 3.1

Twins: A Nature / Nurture Opportunity

In this investigation, one of 24 throughout the webtext, students explore the epigenetics of identical twins and discover how twin research contributes to the ongoing debate about the effects of nature and nurture on mental development.
Artifacts include an article from National Geographic and Learn.Genetics video.