Many countries were concerned with the spread of communism after the end of World War II. Which organization was created in
1949 when the United States, Canada, and many western European nations agreed to form a military alliance for defense against
the Soviet Union and its allies?

A. North Atlantic Treaty Organization

B. United Nations

C. North American Free Trade Agreement

D. Warsaw Pact

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.