Answers: 1
Health, 22.06.2019 15:20
[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.
Answers: 2
Health, 23.06.2019 09:00
Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition select the best answer from the choices provided
Answers: 2
Health, 23.06.2019 21:00
Different plant and animal species have a great variety of body structures that them survive and reproduce. which of the following is also true? a. the individual cells of plants and animals cannot perform specialized functions. b. the individual cells of plants and animals function in very similar ways. c. the individual cells of plants and animals do not share any similarities. d. the individual cells of plants and animals do not contain genetic information. reset submit
Answers: 1
Homocysteine is bad for the heart because it can...
Spanish, 12.11.2020 18:50
Mathematics, 12.11.2020 18:50
Mathematics, 12.11.2020 18:50
Mathematics, 12.11.2020 18:50
English, 12.11.2020 18:50
Mathematics, 12.11.2020 18:50
History, 12.11.2020 18:50
History, 12.11.2020 18:50
Arts, 12.11.2020 18:50
History, 12.11.2020 18:50
Biology, 12.11.2020 18:50