The phenomenon of living fossils -- The advent of skeletons: the brachiopods -- Before modern predation: the flat clams -- the Kraken wakes: nautilus and the rise of the ammonites -- Death of the polypi: nautilus and the last ammonites -- Timeless design: the horseshoe crabs -- The first spring: plants invade the land -- Out of the ooze: the lobe fins.
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