According to the Quran, in the creation of the heavens and the earth, and the alternation of night and day, there are ____ for those who understand?

According to the Quran,?in the creation of the heavens and the earth, and the alternation of night and day, there are ____ for those who understand?

According to the Quran, ?in the creation of the heavens and the earth, and the alternation of night and day, there are ____ for those who understand?

• Pictures
• Words
• Voices
• Signs

ANSWER 

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• Signs