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

B is the correct option

Explanation:

these mechanisms may play a fundamental role in precipitating the development of a large and diverse number cancers in whales due tho the polyclic aromatic hydrocarbon pollution.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg