Yes it is true.
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In terms of individual states, the answer would be New Jersey. Otherwise, the REGION that is most densely populated is the east coast, specifically the Northeastern part of the U.S.
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Reason a is the correct one, as the european union has nothing to do with protection from invasions and Germany reunified many years ago.
The cardiac cycle is defined as the steps involving the conversion of deoxygenated blood to oxygenated blood in the lungs and pumping it by the heart to the body through the aorta. So i think it would be stable over the years unless u have factors that will affect the cycle depending on a persons health
