Natural or artificial? How to tell?

You gotta see the graphic. It’s astonishing:

“What’s good for something is tied to its nature … Nature is whatever a thing is supposed to be or become on its own,” Fr. Walshe says. “It’s important to distinguish a natural inclination from a conscious or emotional desire.”

Ruth Institute, “How to Tell When Something is Natural or Artificial” at The Stream (April 20, 2022)

How do we know the tree did not grow itself that way? Can someone come up with a concise explanation?

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