How was Russia's role in the events leading to World War I different from that of Austria -Hungary ? A. Russia was a member of the Triple Entente, while Austria-Hungary was a member of the Triple Alliance. B. Russia engaged in trench warfare, while Austria-Hungary refused to engage in any nontraditional tactics. C. Russia entered the war at the beginning, while Austria-Hungary entered several years later. D. Russia used modern weaponry , while Austria - Hungary's weaponry was centuries out of date.

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.