Carena has taken a drug that produces striking perceptual changes. wherever she looks right now, she sees beautiful butterflies, objects glowing and changing shapes, and colors are rich and vibrant.
it is most likely that carena has taken:

a. marijuana.
b. lsd.
c. cocaine.
d. ecstasy.

The youngest babies change position once every on average. a. 5 minutes b. half hour c. minute d. 10 minutes

[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.

Jasmine is going out for dinner with her friends. which options are the healthiest for each part of her meal l?