A common practice was to pay ridicilously small wages to workers themselves and pay even less to children and women who were working at factories. Another thing that was done was to either import foreign workers who would have to work for even less, or to move production to companies overseas where they would set up a distribution and where workers themselves would also have to work for very small amounts of money. This increased their profit margins.
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The answer would be the Sodium potassium pump. This structure is the one that plays the main role in the controle of different types of ions under normal cellular function, as well as when cellular function is abnormal. It exchanges sodium and potassium ions from inside and outside a cell through the cellular membrane. With this, a steady amount of ions are found inside and outside.
The artistic decision to use black and white film despite having access to high quality color techniques is a notable feature of Schindler's list. The use of black and whites allows for a realistic recreation of the WWII era environments, tone and aesthetic.