intuit.........................

 All species struggle to survive and strive to reproduce.  A chance mutation about 200,000 years ago made early Homo sapiens more sensitive to social information.  This mutation increased the number of oxytocin receptors in the brain's frontal lobe, enabling out ancestors to not only understand what others were doing cognitively, but also experience the emotions of others.  This helped early humans survive by enabling them to draw on social resources more effectively.

Over time the mutation spread.  Rather than being limited to living in small bands of kin-based groups as our genus had for millions of years, Homo sapiens could live in increasingly larger and more complex societies because they could intuit others' intentions.  The most basic social information is the intention to help or harm.  As culture flourished, societies developed norms in which helpers were embraced and the selfish and violent were ostracized. . . .

We truly became social creatures when the brain network that oxytocin activates allowed us to determine who to trust.  Knowing when to trust strangers led to large-scale societies.  In these communities, an individual's survival depended on many others.  Cooperation among nonkin provided social insurance against a bad crop or an unsuccessful hunt.  Communities began to function like superorganisms in which each segment nourished the other parts.

Paul J. Zak,  Immersion:  The Science of The Extraordinary and the Source of Happiness