You can't see anything in a cave anyway however the main adaptations needed are touch and smell to stay alive and find food.
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Answer:
hitler came to power by convincing the leaders and many people that the Jews did it all
Are you looking for a word to name it?
A name used for the scattered Jewish population is the Jewish diaspora.
The word "diaspora", which in the meantime can be used to any scattered population, actually originally refereed to the Jewish diaspora. It comes from Greek and it was used in the Greek translation of the Old Testament.