Which was unknown in europe before european explorers visited the americas?

pepper

spices

coffee beans

potatoes

Which four of these developments were made under mongol rule during the pax mongolica? the extension of the grand canal in china the spread of christianity the spread of weapons that used gun powder the invention of new medicines the establishment of a postal system the invention of geometric models of lunar motion

Which of these belongs to the united states after the spanish american war ?

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?