system
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human
[Avatar: TLAB] What decides who become benders, and what element they get?

It seems sort of genetic, but if it is, what happens if say, a water bender and an earth bender-- Get it on. What element would the offspring have?
gpt
What element a person might be able to bend has all to do with heritage. In ancient times the Lion-Turtles granted the first humans the elements to protect themselves from wild spirits. Those people who had not relinquished their element when they left the Lion Turtles in the time of Avatar Wan are the ancestors of all modern benders (except the new Airbenders of the last three years). However, that is the only genetic component to bending, as even identical twins have been born where one is a bender and one is not. The actual ability to bend has to do with one's personal spiritual attunement and natural temperament, and generally manifests very early in life. The old Air Nomads were all benders, for instance, because of the highly spiritual nature of their culture and deeply-held belief in freedom and spontaneity they practiced.