How did cataracts in the Nile River make transportation difficult? Cataracts caused parts of the riverbed to dry out. Cataracts contained rocks and boulders that made the river impassable. Cataracts changed the directional flow of the water. Cataracts’ shallow depth and rushing water made the river impassable.

Awoman who refuses to obey the law and continues driving to work everyday.

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.