A New History of Life

Getting a Backbone—The Story of Vertebrates (1520x19)

Ημερομηνία προβολής: Ιαν 01, 2013

Search for the earliest vertebrates, which arose from chordates—animals with a rod-shaped notochord. Also probe the mystery of an extinct chordate called the conodont, which is valuable in oil exploration. Finally, discover why we have calcium phosphate skeletons.