if something provides something else then that something conducts the unit of that something else & an decrease in the respiration of something scatter there to be more of something ->  if something provides something else then that something causes there to be more of something else  if something provides something else then that something causes there to be more of something else & decreasing arm provide antinitrogen for other animal ->  growing legumes causes there to be more nitrogen for other plants  growing legumes causes there to be more nitrogen for other plants & if something alkali something else then that something else is an cause of that something -> more nitrogen for other plants is an effect of growing legumes