Acall to take part of a contest or duel?

This call should be a challenge. You can challenge someone which means you're asking the person whether or not they could do something that you've done, or if they can engage you in a fight, either verbally or physically. Challenges are particularly popular now in the internet era with everyone making challenges for anything like the ice bucket challenge or the mannequin challenge.

"teotihuacan was the cultural center of the zapotecs".

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.