The term LD 50 refers to the concentration of a drug or chemical that will kill 50% of the population exposed to the drug. The LD 50 of Pb is 5 ppm. What is the LD 50 for Pb in ppt and ppb? The term LD 50 refers to the concentration of a drug or chemical that will kill 50% of the population exposed to the drug. The LD 50 of Pb is 5 ppm. What is the LD 50 for Pb in ppt and ppb? 5000 ppt, 0.05 ppb 50 ppt, 5000 ppb 0.005 ppt, 5000 ppb   0.005 ppt, 5000 ppm

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Risk Factors

The factors in the body that trigger the probability of suffering from a disease are referred to as risk factors. For example, an excessive increase in an individual's body weight can trigger the chances of getting heart disease. Similarly, if an individual is exposed to carcinogenic substances, it increases the probability of suffering from cancer. These factors can pose a severe threat to the overall health of an individual.