During the past two decades, over 25% of the beluga whales in canada's st. lawrence seaway have died of cancer. biologists speculate that these deaths are caused by polycyclic aromatic hydrocarbon pollutants. these cause
a. oxidation of g to form an a
b. methylation of c to form a t
c. double strand breaks
d. pyrimidine dimers
e. g to t transversion mutations