It varies depending on behavior. Some things are definitely genetic (or epigenetic), some are definitely trained. Most, by far, have a bit of both.
Last I’ve heard a scientist with relevant research comment on it, she claimed that a reliable figure is “about 60% nature, three rest – nurture.” The context was how much of talent is in-born capacity (think, like, 4th generation circus acrobat vs 1st generation circus acrobat) for developing a skill vs how much of it is amount and quality of practice.
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