Jane, a health psychology major, studies the influence of genetics, gender, socioeconomic status, and behavior on stress. in this case, jane’s study is most likely based on the model.

biopsychosocial                                                                              

Explanation:

Biopsychosocial model: The term biopsychosocial model was introduced by George Engel during 1977, and is defined as a model that examines the interconnection between psychology, socio-environmental, and biological factors.

The biopsychosocial model describes these three aspects that play an important role in determining the disease and health models of human development.

In the question above, Jane’s study is most likely based on the biopsychosocial model.

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first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.