D Question 91 1 pts The most biologically devastating oil spills in the marine environment are usually a result of blow out accidents on drilling platforms natural deep-sea seeps discharge from refueling tankers and ships urban run-off collision and/or sinking of oil tankers D Question 92 1 pts The toxicity of marine pollutants is evaluated through bioassays by estimating the number of trophic transfers in the food web affected by the pollutant determining the total biomass of affected organisms in the environment calculating the concentration at which 50% of the test organisms die determining the length of time that the pollutant remains in the environment the EPA