Diffusion is: A. the movement of a substance across a membrane. B. the movement of a substance by osmosis. C. the movement of substances from an area of low concentration to an area of high concentration. D. the tendency of molecules to move in space due to kinetic energy.

John lennon and paul mccartney belonged to this group

What are objects called that have value in and of themselves as well as value as a means of exchange? custom commodity money currency simple money

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups. b. a researcher conducts a linguistic study of comments posted on a local public blog. c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression. d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.