In 1955, a researcher began a longitudinal study of emotional development from birth to three years of age. In 1985, the same researcher set out to repeat the earlier study. One of the researcher's main concerns should be

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The main concern for the researcher should be the potential environmental changes that could have occurred between 1955 and 1985 that may have affected emotional development. These changes could include changes in parenting styles, societal norms, and cultural values. It is important for the researcher to consider these changes when comparing the results of the two studies. Random assignment, the distinction between correlation and causation, and locating the original participants are also important considerations, but they are not as critical as environmental changes.

In 1955, a Researcher Began a longitudinal study of Emotional