Tubal ligation is:
a. irreversible.
b. reversible.
c. offered to both men and women.
d. when the woman's ovaries are moved.

[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.

Viruses ) manufacture their own atp, proteins, and nucleic acidsb) use the host cell to copy themselves and make viral proteinsc) use the host cell to copy themselves and then viruses synthesize their own proteinsd) metabolize food and produce their own atp

What are the five food groups recommended by the usdas my plate food guidance system