Ironically, the rarity of genes and proteins in sequence space means that even thirty million years is not nearly enough time for the neo-Darwinian mechanism to generate a new gene or protein, much less a new animal form.
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Conway Morris's description is dead on. Imagine the scene he describes -- hiking through gorgeous scenery up to a tiny quarry where you find ancient fossils preserved in incredible detail.
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A while back at Jerry Coyne's blog, Why Evolution Is True, contributor Greg Mayer wrote a post encouraging readers to buy a new 2013 book about the Cambrian explosion.
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There's an old joke about a book critic. Asked if he has read the new book by a certain author, he replies, "No, I only had time to review it."
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