Which of the following is not a way diseases are spread?
a. air
b. skin
c. blood
d. moisture select the best answer from the choices provided. a b c d

[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.

Checking blood sugar levels before, during, and after exercise is important for diabetics. select the best answer from the choices provided. t f

Zoom out so that you can see the whole state of california. select the ruler tool again, but change the type of measurement from line to path. create a path from san francisco to las vegas, to los angeles, to san diego. what is the total length of this path in kilometers and in meters?