Which of the following is true of communicable diseases?
a. communicable diseases are also known as noninfectious diseases.
b. communicable diseases can only be caught from coughs and sneezes.
c. communicable diseases are caused by lifestyle choices such as smoking cigarettes.
d. communicable diseases are caught from food, water, animals, another person, or something else in the environment.

[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.

What three factors shape our personality

Describe 3 ways you can make sure you understand what your boss is asking for in his/her email or memo?