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Over billions of years, ancient fish evolved to walk on land, reptiles transformed into birds that fly, and apelike primates evolved into humans that walk on two legs, talk, and write. For more than a century, paleontologists have traveled the globe to find fossil s that show how such changes have happened.We have now arrived at a remarkable momentprehistoric fossils coupled with new DNA techn ology have given us the tools to answer some of the basic questions of our existence: How do big changes in evolution happen? Is our presence...[Llegir més]