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But the evolution isn’t necessarily the important part, it’s the two parts having separate development processes in modern day humans that is notable.

• TeMPOraL 8d ago
  You mean like, "assembled from two separate components"?
  • sdenton4 8d ago
    More like, they are two separate components, with some interwiring. Components, which we might also call organs. Two of them.
    • TeMPOraL 6d ago
      My objection is with the word "organs", which for everyone except maybe biologists and doctors (depending on the specialist definition of "organ") connote the developed piece of machinery inside a living thing. Not the transient state while it's still gestating.
      • sdenton4 6d ago
        Organs are all interconnected as well. The hind brain and fore brain take on different tasks, as we've known for ages. I don't really have a problem calling them different organs.