Sheila was in a terrible accident six months ago that left her best friend paralyzed. she still is startled by the slightest sudden noise and suffers from sleeplessness, nightmares, and numbness. she has trouble concentrating on anything for a long time and has stopped hanging out with her friends.

[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.

What advantage is the cell wall in relationship to osmotic pressure

What are ways that tobacco use can affect familyand socity