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Unformatted text preview: replicating molecule served as the major informational molecule? a) Lipids b) Protein enzymes c) RNA (ribozymes) d) Primordial soup e) Protocells 4. When did life first appear on Earth? a) 100 million years ago (MYA) b) 200 MYA c) 500 MYA d) 3,500 MYA e) 5 billion years ago (BYA) 5. When did oxygen first become abundant in the Earths atmosphere? a) 1 BYA b) 2 BYA c) 3 BYA d) 4 BYA e) 5 BYA...
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- Winter '12