A) the exchange of gases throughout the body
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<em>You could be passing though of someone or something cause...like say </em>
<em>-You had been lied to from a friend ..your thinking of beating your friend up </em>
<em>-You could of have been picked on by the popular kids at school..You want to confront the popular kids that you have had enough !</em>
<em>-You could of have gotten your arm broken by someone twisting it and not saying sorry....You want to tell on that kid</em>
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1/2 I think because it is supposed to be 50% which is basically 1/2.