Agroup of scientists observe a group of college students over 4 years to determine which of the characteristics leads to weight gain. the study id an example of

prospective study

Explanation:

According to my research on different research methods, I can say that based on the information provided within the question the study is an example of a prospective study. This type of research method focuses on studying a group of subjects and observing them over a long period of time in order to watch for specific outcomes.

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answer; during stalin"s rule, many mothers told their children that he was the greatest thing to ever happen to russia;