Which condition does a smoker have who had a hard time breathing because the airways are constantly inflamed and full of mucus

[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.

Select the correct answer from each drop-down menu anne has a endocrine system disease. choose the correct way to complete each sentence

True or false: determining the source and motive of an ad for a health product will you decide whether the ad is a reliable source of health information.