Which description indicates a problem with the social aspect of health?
alex is the captain of the soccer team and is very popular. he's a very picky eater, especially about vegetables.
barbara exercises regularly and eats nutritious food. she is very shy and keeps to herself all the time.
ross enjoys rock-climbing adventures with his four best friends. he enjoys junk food in moderation.
laney loves to spend the afternoon at the burger joint next to school with her friends. she dislikes exercise.
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Which of the following is an important function of child-directed speech? (a) it captures the infant’s attention and maintains communication. (b) it reduces the occurrence of infantile amnesia for the earliest memories of infancy. (c) it reduces the need for reciprocal interaction between caregivers and children. (d) it assists in prolonging rem sleep in infants.

[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.

About how many individuals in the us go bankrupt each year due to medical bills?