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Earth (Life in Earth (Theories to Earths Origins (Urey-Miller (objections,…

- - - - oceanic vents contain ingredients to make simple organic molecules
    - - analysis of meteorites indicate organic molecules found in space, may have been 'seeded' by meteorite strikes
    - - objections
        
        amount of gases does not reflect actual early atmosphere
        
        doubts to hydrogen was present
        
        lightning strikes no sufficiently frequent
        
        may not have formed in atmosphere
      - form organic from inorganic
  - - - describe quickly
      - enables trends to be observe
      - communicate simpler
      - identity relationships, establish evolutionary pathways
      - newly identified organisms belong to particular group
- - - - flightless birds
        
        Cassowary, kiwi