Tracy and Shahid are not related to each other.  They are both 4 months old and have lived together since birth (with their parents and siblings) in a communal house in Switzerland. They have the same diet and same environment and all parents share parenting duties among themselves, so the kids are exposed to a wide variety of parenting styles.   Tracy is highly active, easily irritated, and cries frequently for no apparent reason. Shahid is quiet, adapts easily to change, rarely cries, and seems fearless. These differences illustrate ________

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Tracy and Shahid are not related to each other.  They are both 4 months old and have lived together since birth (with their parents and siblings) in a communal house in Switzerland. They have the same diet and same environment and all parents share parenting duties among themselves, so the kids are exposed to a wide variety of parenting styles.   Tracy is highly active, easily irritated, and cries frequently for no apparent reason. Shahid is quiet, adapts easily to change, rarely cries, and seems fearless. These differences illustrate ________

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