• tetris11@feddit.uk
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    5 days ago
    • Shells are soft gloopy things laid in lakes
    • Evolutionary advantage: Eggs laid on the edge of lakes away from water predators
    • Evolutionary advantage: Harder eggs survive longer further out of water
    • Evolutionary advantage: Harder land eggs give rise to amphibous/land animals
    • Evolutionary advantage: Amphibous/land animals lay land eggs
    • etc.