Why was china isolated from other cultures for a long time? a the wet climate kept people from other countries from visiting. b the huang he river acted as a natural barrier against invaders. c the region was large and had difficult terrain. d pan gu was a dictator who didn't allow trade with other countries.

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.

Thanos 100% donald trump 0.001%