Awoman gave birth to a healthy 7-pound, 13-ounce infant girl. the nurse suggests that the woman place the infant to her breast within 15 minutes after birth. the nurse knows that breastfeeding is effective during the first 30 minutes after birth because this is the:

Which of these is a symptom o anorexia nervosa

Increased use of cocaine can reduce the period of stimulation. true or false

[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.