The research method that would be best at determining that human behavior is either a product of nature or nurture would be______________.

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Question restatement: The research method best at determining whether human behavior is a product of nature or nurture would be __________.
Option 1: correlational research. While correlational studies can show whether two variables are related, they cannot establish causation or disentangle genetic from environmental influences, so this method falls short for nature vs. nurture questions.
Option 2: naturalistic observation. This approach involves watching behavior in natural settings without manipulation, which reveals what people do but not the extent to which genetics or environment drive those behaviors; it also cannot separate heredity from upbringing.
Option 3: twin studies with non-identical twins. Studying fraternal twins introduces some genetic similarity but not as precisely as identical twins; while helpful for certain questions, non-identical twin designs are less powerful for disentangling nature versus nurture than identical-twin comparisons.
Option 4: twin studies with identical twins. This design is most effective for parsing genetic and environmental contributions because identical twins share nearly all their genes, so differences in behavior can be attributed more to environmental factors, while similarities point to genetic influences. This makes it the best method for addressing the nature versus nurture question.
Overall, options 1–3 do not provide as clear a separation of genetic and environmental effects as option 4, which leverages the genetic sameness of identical twins to isolate environmental influences and genetic contributions.

The research method that would be best at determining that human behavior is either a product of nature or nurture would be______________.

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