Unison to keep directories in sync on multiple machines rdiff-backup for backups and keeping old versions

I guess I should rephrase my question.

How do we know it "developed" these features? What makes us think that this wasn't a species of animal that just always had these features?

I can definitely see the line of thinking if you begin with the assumption that there is no God, or Supreme Being, or external creative force, because that would fall into place very nicely.

But if you begin with the assumption that there is indeed a supreme being that created life, then I don't think this holds up as proof. If I believed in intelligent design, then I would assume that this being was created with these features, and just became extinct somewhere along the way.