What is a sound ? → Meow

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Which of the following requires the action of a first class lever in the body

If gloves become heavily soiled and additional patient care tasks must be performed on that patient, what should you do? a. no action is necessary as it's the same patient b. change gloves c. double glove d. wash the gloves

[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.