What new social class was added to the social structure in the Western World as a result of the Industrial Revolution? *

The aristocracy as land became increasingly more important due to the belief in imperial control
The working class, which was made up of the factory workers and other workers of the economy.
The middle class, whose occupations included merchant and banker
The lower class as no society had poor people until the Industrial Revolution

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.