Dawkins organizes his "cast-iron case" by sifting through various layers of scientific fact:
: He highlights anatomical "errors" that make sense only through evolution, such as the recurrent laryngeal nerve (which takes an unnecessarily long route in giraffes) and human "tail" remnants. The Greatest Show on Earth: The Evidence for Ev...
: He discusses "molecular clocks" and pseudogenes—useless, untranscribed DNA sequences that serve as historical records of ancestry. Key Themes Dawkins organizes his "cast-iron case" by sifting through