A team of toxicologists produces this dose-response curve for a particular pathogen, Pathogen C, found in chicken eggs.

A team of toxicologists produces this dose-response curve for a particular pathogen, Pathogen C, found in chicken eggs. On the x-axis, the toxicologists use a log scale to represent increasing numbers of pathogenic cells per serving of contaminated eggs. On the y-axis, the toxicologists represent the percentage of people made ill by exposure to different concentrations of pathogenic cells. 

(a) Using Pathogen C as an example, explain the difference between LD50 and ED50. Then use the dose-response curve to answer the following questions about Pathogen C.

• i.