Sorry for asking this here, but i fell of bike and hurt my ankle, I can move it well but i can t bear weight on my heel, what do u think it is? It s not swollen or anything

When talking about memory and interference, what does the cluttered room example illustrate?

Write a paragraph about why the respiratory system is important and we need to breathe easily. (guys i really need ) x(

[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.