Twin studies suggest that schizophrenia
A) is caused entirely by genetic factors.
B) is caused entirely by environmental factors.
C) is likely caused by a combination of genetic and environmental factors.
D) is more likely to occur in twins than non-twins.
Answer: C
Rationale: Twin studies indicate that having certain genes may put individuals at risk to develop schizophrenia. However, they also indicate that schizophrenia is not strictly a genetic disorder, and they suggest that environmental factors might increase the risk that an individual will develop schizophrenia.
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