Population density shows how cramped or spread out inhabitants are. Cities with high population densities can be considered overpopulated, but the extent to which this is the case depends on factors like quality of housing and infrastructure and access to resources. Source: Wikipedia, 2017.
Livor mortis on the posterior aspects of the body is caused by settling of the blood because of gravity when the body is in a supine position. As the postmortem interval lengthens, Tardieu spots develop in areas of lividity, such as this individual's shoulder area, as decomposing capillaries rupture.
Livor mortis in a corpse. Coroners can use the presence or absence of livor mortis as a means of determining an approximate time of death. The presence of livor mortis is also an indication of when it would be futile to begin CPR, or when it would be ineffective to continue if it is in progress.