The evolutionary implication is that we are descended from a common ancestor with flies which used the same way of defining the pattern of the embryo more than 530 million years ago, and that the mechanism was so good that all this dead creature’s descendants have hung on to it.

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Quote text and notes from Wikiquote: Matt Ridley (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.