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Biff and His Twin Brother Bernie, Were Part of a Twins

Question 96

Multiple Choice

Biff and his twin brother Bernie, were part of a twins study. They were first observed by the researchers when they were 5 years old, and then again later when they were 10 years old. What type of a study were they in?


A) case
B) cross-sectional
C) longitudinal
D) periodical

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