How was protein synthesized from amino acids in the prebiotic world?

I agree with Jdrnd. Living things have had over a billion years to colonize the entire Earth. I don’t think there is anyplace where you can still observe “non-living nature”. If by some chance, proteins began to be synthesized now from amino acids, something would gobble them up immediately! You’d have to go to some other planet… which is one reason why NASA is so keen on sending all those space probes to Jupiter and Saturn.