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Cambrian Explosion (Rise of Animals (Bacteria evolve into animals (After…

- - - - Fossil record is biased
  - - - More favourable habitats ?
      - Atmos oxygen increase?
      - Seawater chemistry change ?
- - - - animal functions/ mobility / bilateral symmetry
    - - Major modern body plans
      - Macroscopic (large) size
      - Diverse & many ecologies
      - Skeletal animals radiate & dominate
    - - skeletons develop
      - reef building / colonial ecologies