I believe bending is a mixture of both. The core is in the genetics, but the ability to use bending is in the spirit. My reasons:
-Sokka and Katara; both siblings, only one can bend. Katara seems to be more at peace with herself most of the time, so she can bend. or something like that
same with the twins in "the fortune teller"
But, since the avatar can bend all four elements, i also beleive the previous avatars OR other gods give the avatar the ability to bend all of the elements
Avatar the last airbender guild
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