RELATED QUESTIONS

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  Why doesn't a cough have to be involuntary
• 
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  Why doesn,t the water cover the earth?
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  If coughing can be voluntary then why is it nothing like other voluntary actions
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• 
  if s and t are the two roots of x^2-7x+2=0, the quadratic equation whose roots are s+1 and t+1 is equal to?
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