Which disease that emerged in the 1980s led to a worldwide epidemic and one of the largest health concerns in regard to investigating its prevention and a possible cure?

The part of the nephron provides initial filtering of the blood in the urinary system.

Which step in healthy decision making requires you to look at the decision you made and determined whether different actions would have produced different results

[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.