Agricultural pollution can occur if waste from livestock is not disposed properly

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine. what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.

Which food preservation method can people use at home? a. fermentation b. irradiation c. pasteurization d. thermal processing

Protein deficiency can result in a malfunctioning metabolism, a weak or irregular immune system, and possible blindness and deafness a rapid period of weight loss a significant and rapid weight gain damage to connective tissue and bones