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In one investigation, researchers followed three adolescent cohorts, each born a year apart, over three years to see if family harmony changed as the participants experienced dramatic physical and psychological changes. After ruling out ________, the researchers concluded from this ________ design that family closeness declines steadily from sixth to tenth grade.

User Zong
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Answer:

cohort effects and sequential

Step-by-step explanation:

User Djatnieks
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