Why was the scientific revolution a pivotal time in history?
a. it changed humankind's approach to understanding the natural
world and led to new discoveries.
b. it affected the political boundaries of europe and eventually the
rest of the world.
c. it proved once and for all that the theories of the ancient greek
and arabic philosophers were valid.
d. it increased the influence of the roman catholic church in europe.

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.