If substance a has an ld50 of 5 mg/kg of body mass and substance b has an ld50 of 10 mg/kg of body mass, which substance is considered more deadly? substance a is deadlier than substance b. substance b is deadlier than substance a. both substances are lethal enough to affect most of the population. neither substance is lethal because it did not reach at least 50 mg/kg.
