Answer:
Only the healthy, able-bodied prisoners were suited to work. As a result, those in ill condition who could not work or 'contribute' were seen as useless and therefore disposed of. The Nazis also likely did not want people of 'inferior race' reproducing.
Answer: They didn't have the ability to do work that the Nazi's wanted.
Explanation: Since they were so weak, they could not do the slave work like many stronger men did. They didn't have any use to the Nazi's.
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