My question is regarding the things which can decide your vocal range and how people's vocal ranges are different from each other and also if there are patterns like race, language, etc. which can affect people's vocal range.
I'm personally a baritone and I currently live in Iran, a country in the middle east. The city in which I live has a dry weather and not much raining (+pollution), also my dad is a baritone. Well, some of my friends who live in a city other than the place I live, a city in the north, all are tenors, can sing very high notes. I've also heard from my coach, most of males in my country are tenor!
I was wondering if living in a country can typically be a sign for a singing expert to estimate your vocal range or not! Can vocal range of people generally be related to race, weather conditions, altitude or anything else like a language? For instance, if your mother is Chinese will it affect your vocal range to be different to someone who speaks French? Do words and the way they're produced by human beings affect the vocal range of people generally? What are things which decide one's voice range?