1 Chapter 18: Classification. 2 18–1 Finding Order in Diversity Life on Earth has been changing for more than 3.5 billion years Life on Earth has been.
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Chapter 16. Subject A = Chimpanzee Subjects J-L = Neanderthal (70,000 to 45,000 years ago) Subject M = Cro Magnon (30,000 years ago) Subject N = Modern.
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