What can be the bases for the division of a country in federal structure? give short introduction to each of them. ​

How did european immigrants of the late 1800s change american society

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.

The document asks about dependents because the number can affect who pays taxes. increase overall taxes. lower overall taxes. affect when to pay taxes.