Life is the number of years that the average person born in a particular year will probably live.

During the late 19th century, russia's settlement and development of siberia was made possible by the invention of the

The u.s. intervened in korea and vietnam to stop the spread of

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?