Hmmmm….good question. I think it has to be our DNA – our shared evolutionary past. After all, it’s only 6 million years since humans and chimpanzees were the same species….you go back in time and see how the species we know today change through time and how many many that used to live went extinct, and you realise that the things that make humans and animals similar, are far greater than the things that make us different.
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