As caravelas por conta de sua leveza e da forma de suas velas, foi uma invenção que tornou as viagens marítimas mais rápidas. A - Contemporâneo, nas migrações dos chamados povos bárbaros.
B - Medieval, com a expansão do império de Alexandre , o Grande.
C - Modernos, na expedições portuguesas e Espanholas.
D - Da segunda revolução industrial, no século xx.
E - Da Expansão do Império Romano no século ll.

"the socialist system that had been in place had brought economic ruin to the country." i hope this !

The first immigrants to settle in what is now the united states were the ancient ancestors of modern native americans. the precise routes of those first north american immigrants are disputed, but there is no uncertainty about the fact that every human being on the continent is either a recent immigrant or a descendant of earlier immigrants. since the first immigrants came here from asia more than thirteen thousand years ago, there have been four large and easily recognizable modern waves of immigrants into the united states.

The answer would be a.