This is what is known as causation. Many events appear to be the results brought about by identifiable causes, and the human mind is geared to look for these cause/effect relationships. We get into trouble when the mind seeks or creates an artificial cause/effect relationship that doesn't actually exist.
Copy means written words or text of any kind in various genres. Ad copy means text written specifically to sell something. Body copy refers to text that is in the middle or main part of a piece of writing. Sometimes it's easier to define something by what it isn't.
duplicate. A copy is as nearly like the original as the copyist has power to make it; a duplicate is exactly like the original; a carbon copy of a typewritten document must be a duplicate; we may have an inaccurate copy, but never an inaccurate duplicate.