Why did nazi germany build concentration camps in poland?

Which of the following inventions most directly allowed ancient farmers to produce a surplus ?

How was the storming of the bastille important to the french revolutiona) it forced the king to accept the people's demands for justice. b) it marked the official beginning of the french revolution. c) it compelled the government to treat people with respect.d) it exposed the french soldier's lazy attitudes and weak skills.e) it symbolized the constitutional monarchy.

The middle east is the best association with which international traded product