Twin twin studies research indicates that two-thirds of personality can be attributed to
a.

nonshared environments
b.

shared environments
c.

genetic influences
d.

environmental influences

Twin studies research indicates that two-thirds of personality can be attributed to genetic influences.

Explanation:

Students that have been performed analyzing twins' personalities demonstrate that even when they can be influenced by many factors like environment or nurture, the biggest part comes from genetic influences, there are records of identical twins who have grown up in different familiar environments and they have similar personality traits.

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