Simple one-celled cyanobacteria-like organisms appeared on Earth:

  • A
    $5600 \text{ million}$ years ago
  • B
    $5000 \text{ million}$ years ago
  • C
    $4600 \text{ million}$ years ago
  • D
    $3.3 \text{ to } 3.5 \text{ billion}$ years ago

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