The turning point in greek history was the
a. persian wars
b. hellenistic period
c. peloponnesian wars
d. alexander period

There were many turning points to be honest, but perhaps thte most influential one would be the Hellenistic period - B.

With the age of the Hellenistic period, Greece was for the first time unified under a single banner under the leadership of Alexander the Great who not only unified Greece but also conquered vast amounts of the Middle East with it. 

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.