According to evolutionary theories about the tend-and-befriend response, why is there a gender difference in this particular stress reaction?

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Evolutionary theories suggest that women have evolved to rely more heavily on building social networks when under threat because historically they were more likely to be caring for offspring and in need of support from others. In contrast, men were more likely to engage in fighting to protect resources and offspring, which required the activation of the fight-or-flight response. This gender difference is thought to be a result of selective pressure over thousands of years of human evolution.

According to Evolutionary Theories About the Tend-And-Befriend Response, Why Is