Julia and Erin are identical twins who are raised by two very different families. Because they were separated at birth, neither knows that they have a sister, and there is no shared environmental influence on their development. If they grow up to have very similar personal traits and characteristics, we might infer that these similarities are the result of __________.
a. different parenting.
b. mitosis.
c. heritability.
d. developmental abnormalities
Answer: C
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