The portion of england ceded to the danes to keep peace was called the danelaw.

This statement is true. Danelaw was the portion of England that was ceded to the Danes to keep it in peace. Danelaw lies on the northeastern part of the English and it consists of West Saxon law and Mercian law.

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.