Fifth, when a true relationship is found, scientists concern themselves with the reason for such established connections between phenomena (and, for ingested chemicals, whether there are attending unwanted side effects). Models of the biological, physical, and chemical processes are examined for an explanation of the relationship so that its full understanding can become a useful part of world knowledge. Scientists try to determine if the correlated phenomena are in a cause-and-effect relationship or whether they result from a common cause.

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