Which of the following statements is true? a) physical abuse is serious physical injury inflicted that is non-accidental. b) emotional abuse is expression of attitudes or behaviors toward a child that may create psychological damage. c) neglect is any serious disregard for a child's supervision, care or discipline. d) all statements provided are true. all the above right?

True or false. mucous membranes secrete mucus that traps pathogens.

How quickly a drug enters your bloodstream also depends on

[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.