Which numerical system did muslim scholar al-khwarizmi use as a basis for the set of arabic numerals he developed? a. greek b. persian c. hindu d. roman

The numerical system that Muslim scholar Al-Khwarizmi used as a basis for the set of Arabic numerals he developed was the B) Persia numerical system. Al-Khwarizmi made significant contributions to algebra, arithmetic, astronomy, trigonometry and geography. He also greatly expanded on mathematical and astronomical work which had been done by previous Hindu and Greek scholars. 

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.