What is true of mice is just as true of people. Flies and people are just variations on a theme of how to build a body that was laid down in some wor… - Matt Ridley

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What is true of mice is just as true of people. Flies and people are just variations on a theme of how to build a body that was laid down in some worm-like creature in the Cambrian period. They still retain the same genes doing the same job. Of course, there are differences; if there are not, we would look like flies. But the differences are surprisingly subtle.