Rosy is a happy child who smiles a lot. Elijah Blue is not, by nature, a very happy child and more often has a frown on his face than a smile. Other people tend to smile at Rosy much more than they smile at Elijah Blue. The different responses Rosy and Elijah get from the environment is best described as

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The different responses Rosy and Elijah Blue get from the environment is best described as an evocative gene-environment relation. This is because Rosy's happy demeanor elicits positive reactions from others which reinforce her behavior, while Elijah's lack of happiness may elicit less positive reactions from others, which in turn may lead to a reinforcement of his demeanor. This is an example of how one's genetic predispositions can evoke particular reactions from the environment.

Rosy Is a Happy Child Who Smiles a Lot