The political controversy that makes objective research on newborn pain difficult is: culture varies.
Research can be defined as the data or information collected so as to draw or reach a conclusion after evaluating the result of the research.
The political controversy that makes objective research on newborn pain difficult is culture varies based on the fact that some cultures tend to believe warmth or better than being clean while on the other hand some cultures tend to believe being held close is healing, while others tend to believe less contact.
Therefore the political controversy that makes objective research on newborn pain difficult is: culture varies.
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