The answer is a skills such as making shoes and blowing glass were lost for many years
Karl Marx was an influential German thinker and revolutionary who pioneered the idea of Communism. Communism is a social, political, economical, and philosophical idea which has the absence of social classes, money, and the state in the society. Communist societies has two social class: the working class and the capitalist class.
Germany invaded Poland if thats one of the answer choices
(1) data triangulation: the use of multiple data sources in a single study; (2) investigator triangulation: the use of multiple investigators/research- ers to study a particular phenomenon; (3) theory triangulation