LDs0 and LCso LD5o=the dose of a substance that kills 50%of a population of test animals measured in milligrams of toxicant per kilogram of body weight_(mg/kg) 96 dead 50 dead 12 dead Dose:100 mg/kg 10 mg/kg 1 mg/kg LCso concentration of a substance in air or water that kills 50%of a test population, measured in parts per millionLD50 and LC50 ❖ LD50 = the dose of a substance that kills 50% of a population of test animals ❖measured in milligrams of toxicant per kilogram of body weight (mg/kg) 96 dead 12 dead Dose: 100 mg/kg 10 mg/kg 1 mg/kg 50 dead ❖LC50 = concentration of a substance in air or water that kills 50% of a test population, measured in parts per million