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I think when we grow up our bones also grow so when we get an certain age our bones expands rapidly then the bone at the place of knuckles comes
forward. I think
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When you “crack” your knuckles, or any other joint, it expands the space between your bones, creating negative pressure that draws synovial fluid into the new gap. This influx of synovial fluid is what causes the popping sound and feeling when you crack a knuckle.

pls mark my answer as brainliest
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