Question

Hardest Riddle Ever...........

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Answer 1

Hey!
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The Answer Is Time.

Cause When Polar Bears Are Born They Are Yellow.
Time Makes You Cry Sometimes.

I won't Tell All Reasons.

Hope It Helps.

Answer 2

Answer:

Air? Or Pressure...think it's more likely to be pressure. Here's why:

I turn polar bears white (the air pressure and weather)

and I will make you cry. (Everyone cracks under pressure)