What is most important about the Arctic and the Antarctic

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What is most important about the Arctic and the Antarctic circles ?

1. Within these circle only can the days and nights be longer than 24 hours
2. The days and nights are never more than 24 hours long here
3. Both areas frozen continents
4. Both regions are uninhabited

Correct Option: A

Within these circle only can the days and nights be longer than 24 hours