Recently developed techniques such as functional neuroimaging
a) have strengthened the relationship between anxiety-related personality traits and genetic mechanisms.
b) have demonstrated a pervasive disconnect between extraversion and genetics.
c) cannot be applied to studies of personality and genetics as of yet.
d) have been used to identify unknown genetic differences between monozygotic twins.
Answer: a) have strengthened the relationship between anxiety-related personality traits and genetic mechanisms.
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