What was the reason Gregor lost his ability to move?

Because he goes through metamorphis

Explanation: Despite his complete physical transformation into an insect at the beginning of the story, Gregor changes very little as a character over the course of The Metamorphosis. Most notably, both as a man and as an insect Gregor patiently accepts the hardships he faces without complaint.

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in night, why are wiesel and his father evacuated from the auschwitz concentration camp? a massive escape makes the nazis question the security of auschwitz. they are assigned to work as laborers in a factory at another camp, buna. hitler has ordered that all remaining jews be relocated within german borders. the german army needs the camp guards to go to the battle front for a last-chance defense.