What effect did urbanization have in Germany?

Who is soccer player win world cup champions league premier league play with cristiano ronaldo with messi & henry

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

The information box says that the han added 4,000 miles of wall.refer to the mileage scale.how can this be true?