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Evolution of Skeletons (Oldest Skeleton Fossils (Cloudina 549-542 Myr…

- - - - coral network
      - shells
      - arthropod exoskeleton
- - - - Nama Basin, Namibia - Rocks 560-540 Myr
  - - - Local aggregate colonies
- - - - At/nr beginning Cambrian
      - in the fossil record
    - - devleloped by nearly everything
      - simultaneously by many groups
      - independenltly