Healthy bodies come in a variety of shapes and sizes. what is an example of why we cannot judge a person's health based on his or her body size? an ectomorph may eat a well-balanced diet an ectomorph may ride bikes every day an endomorph may have hypertension an endomorph may exercise regularly

[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.