You selected C. Here’s how others in your region answered. Click Continue to proceed to the next question.
A
43%
B
5%
C
26%
D
25%
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Interesting fact:
If you’ve ever cracked your knuckles, you might have wondered where the sound was coming from. There is a fluid that contains gasses like carbon dioxide, nitrogen and oxygen when you pop or crack a joint. Gas is released and forms a bubble which pops! To do it again, you have to wait till the gasses have revived themselves.
