From professional translators, enterprises, web pages and freely available translation repositories.
at the end of the cretaceous period, 65 million years ago, 60 to 75 % of species were killed off, including most of the dinosaurs, large marine reptiles, ammonites and flying pterosaurs .'
la grande estinzione del permiano, circa 250 milioni di anni fa', ha cancellato il 90% di tutte le specie viventi.
