Answer:
Sound waves. I hope this helps.
Majority of people worked in farming. So I would say C farming
Though a map is missing, looking up any map of Germany it is easy to realize its advantageous position right in the heart of Europe. Trade and cultural exchange with Northern, Southern, Eastern and Western Europe is easy because of the above mentioned position in the European continent. Furthermore, Germany has easy access to the Baltic Sea to the East, linking the country to Scandinavia and the eastern European countries such as Poland and Russia, plus it also has easy access to virtually any other part of the world because of its main seaport: Hamburg.To the West, the Rhine River has served Germany for centuries as an important waterway of communication with the Benelux countries and France. To the South, it is in direct contact or relatively close to other important countries in the region such as Austria, Switzerland, the Czech Republic, Italy, etc.
