Riddle (Roots)?!

Question: What has roots as nobody sees,
Is taller than trees
Up, up it goes,
And yet never grows?

Answers: What has roots as nobody sees,
Is taller than trees
Up, up it goes,
And yet never grows?

mountain

family?

mountain or family or BOTH

air

probably mountain because families do grow...hmmm...I really can't think of anything else it might be.

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