What methods were used by Bouchard and Lykken to study the impact of genes and environment on psychological characteristics?
A. They studied siblings raised in the same home and looked for common characteristics.
B. They studied adopted children raised in the same home and looked for common characteristics.
C. They studied identical twins raised in different environments and looked for common characteristics.
D. They studied good friends who shared a mostly common environment and looked for common characteristics.
Answer: C
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_______________ is the only social interaction threat that primarily involves the people who help manage the research context rather than the participants themselves
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