Dr Nuzhdin thinks that the main reason why copia does not proliferate like this in wild populations is that natural selection keeps these transposable elements in check.
Unlike most of its competitors, Southwest does not impose additional fees for items such as seat selection, fuel surcharges, curb side check-in and telephone reservations.
But the White House has made calls to various candidates saying the president intends to nominate them pending a background check, according to another person familiar with the selection process.