Are people that are quiet biologically and genetically born that way?

I'm guessing that people that are loud versus people that are quiet are gifted with more lung power or lung capacity to talk louder or talk more often than people that are quiet. Do you think body biological makeup has any bearing on a person whether they're quiet or not?



Are people that are naturally quiet usually have other people in their family that are quiet too? I assume this could be true because genetics could play a role in how people interact around other people.Are people that are quiet biologically and genetically born that way?
yes sometimes. environmentally, u can have different types in one family - noisy, quiet, half-half. somebody gotta talk. or a traumatic event can make someone quiet. or being run down, scolded, chided during childhood can change a personality. false ego. lungs have nothing to do with loudness. proverb:empty vessels makes the most noise