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"popped up" = appeared suddenly like a jack-in-a-box-"evolved" = appeared gradually over a long time period

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GPJ

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How did sex pop up? David Turell 2009-09-17, 02:10 PM
- How did sex pop up? xeno6696 2009-09-18, 02:34 AM
  - How did sex pop up? George Jelliss 2009-09-19, 05:15 PM
    - How did sex pop up? dhw 2009-09-20, 07:15 PM
      - How did sex pop up? George Jelliss 2009-09-21, 10:01 PM
        
        How did sex pop up? David Turell 2009-09-22, 01:05 PM
        
        How did sex pop up? dhw 2009-09-22, 04:19 PM
        
        How did sex pop up? George Jelliss 2009-09-22, 07:19 PM
        
        How did sex pop up? David Turell 2009-09-23, 12:14 AM
        
        How did sex pop up? George Jelliss 2009-09-23, 11:58 AM
        
        How did sex pop up? dhw 2009-09-23, 09:37 PM
        
        How did sex pop up? George Jelliss 2009-09-23, 10:28 PM
        
        How did sex pop up? dhw 2009-09-25, 03:40 PM
        
        How did sex pop up? How did sperm get in? David Turell 2019-07-19, 01:12 AM
        
        How did sex pop up? it involves the ability to fuse cells David Turell 2022-02-16, 06:59 PM
        
        How did sex pop up? a study of hermaphrodites David Turell 2022-06-15, 03:53 PM
        
        How did sex pop up? a study of sperm swimming David Turell 2022-10-11, 04:40 PM
        
        How did sex pop up? a study of sperm structure David Turell 2023-06-16, 04:04 PM
        
        How did sex pop up? complexity of egg-sperm union David Turell 2024-02-11, 04:19 PM