A、The existence of salmon populations in rivers where the elimination of salmon habitat by human activity had previously made the fish extinct

B、The results of studies measuring the impact on straying rates of habitat loss caused by human activity

C、The potential for disturbances in one environment to cause the introduction of novel genes into salmon populations in neighboring areas

D、The weaknesses in the view that the extinction of entire salmon populations is the only mechanism by which human destruction of salmon habitat reduces genetic diversity in salmon

E、The absence of any reason for believing that disturbances brought about by human activity would differ in their effects from comparable disturbances brought about by natural causes