<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.kufikia kipindi familia imekua, katika dunia ya kale iliyobashiriwa, kuna uwezekano atlantiki ya kaskazini ilikuwa na baridi ya kupita kiasi na kina kirefu cha maji kwa wanyama wa aina hii wa maji-joto kuvuka.6  <response>: by the time the family evolved, ostensibly in the old world, the north atlantic possibly had become too cold and deep for these warm water species to cross.10 