How many of these statements describe the european union (eu)?

there are no tariffs between member nations.
the eu has twenty members.
the dollar is the common currency of the eu. member nations give up some sovereignty to belong to the eu.
eu members speak the same language.
citizens traveling between eu nations do not need to present their passports at the border.
citizens of eu nations can live, work, or study in any member nation.

the right answer is a

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.