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Books > Earth & environment > Earth sciences > Palaeontology
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Across the Bridge - Understanding the Origin of the Vertebrates (Paperback)
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Across the Bridge - Understanding the Origin of the Vertebrates (Paperback)
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Our understanding of vertebrate origins and the backbone of human
history evolves with each new fossil find and DNA map. Many species
have now had their genomes sequenced, and molecular techniques
allow genetic inspection of even nonmodel organisms. But as
longtime Nature editor Henry Gee argues in Across the Bridge,
despite these giant strides and our deepening understanding of how
vertebrates fit into the tree of life, the morphological chasm
between vertebrates and invertebrates remains vast and enigmatic.
As Gee shows, even as scientific advances have falsified a variety
of theories linking these groups, the extant relatives of
vertebrates are too few for effective genetic analysis. Moreover,
the more we learn about the species that do remain--from seasquirts
to starfish--the clearer it becomes that they are too far evolved
along their own courses to be of much use in reconstructing what
the latest invertebrate ancestors of vertebrates looked like.
Fossils present yet further problems of interpretation. Tracing
both the fast-changing science that has helped illuminate the
intricacies of vertebrate evolution as well as the limits of that
science, Across the Bridge helps us to see how far the field has
come in crossing the invertebrate-to-vertebrate divide--and how far
we still have to go.
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