What does present-day science theorize about emotions, as to what causes them and why?
It seems pretty simple to me. Being evolved from less intelligent, less reflective, less communicative beings, why wouldn't we still have the influences on behavior that governed those beings? That's one more potent indicator of the fundamental accuracy of evolution, if you ask me.
When cellular metabolisms evolved to utilize oxygen, they still maintained the anaerobic metabolic pathways that preceeded them. Even your own cells contain these less-efficient forbears. So, too, do we maintain the precedents of behavior.
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