Which principle keeps one state from denying the validity of a birth certificate that was issued by another state

supremacy clause
interstate compact
division of powers
full faith and credit clause

3. suppose most animals behaved in a certain way. would that provide evidence that it is natural for us to follow their lead? if so, what implications would this have for natural law theory? .

What is it called when countries build lots of weapons to store and them in case of a war?

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?