Oceans and Seas, Sea Urchins - embryology, Embryo, Nonmammalian - embryology, Sea Urchins - drug effects, Arsenic - analysis, Luminescent Measurements, Arsenic - toxicity, Water Pollutants, Chemical - analysis, Embryo, Nonmammalian - drug effects, Petroleum, Reproduction - drug effects, Animals, Water Pollutants, Chemical - toxicity, Aliivibrio fischeri - dr...