My 5 year old asked me this question so how would you explain it so it’s really eli5.
In: Biology
this is probably the simple version for your kid
it’s a program/app that programmed/installed in every living being from the moment they are born. it helps them survive in the world until they can have their own kids
how do they know what to do? the instinct told them to. though, it usually only works on simpler stuff like pain=bad, therefore, avoid pain. fire=hot=pain=avoid, hungry=eat, etc etc
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