Which best explains what happens when scientific theories do not stand up to repeated experimentation? they remain theories but cannot become laws. the theories change to fit current data. the theories are replaced with hypotheses. scientists redesign their experiments to fit the theories?

Plz 20 ! in a citizens elect the president as head of government separately from the legislature? a: parliamentary democracy b: communist state c: presidential democracy d: autocratic state

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.

What was discussed at the yalta conference