ANSWERS: 1
  • Metaphorically, none. They are stone cold killers. Not only are they cold-blooded, but their blood is made of copper in place of iron (many invertebrates are this way). The copper-based blood runs thicker and more viscous, especially in the cold unforgiving ocean, so their circulatory systems require three hearts instead of just one. But the hearts are not simply redundant. Our own human hearts are divided into four chambers. An octopus's situation is as if those four chambers were divided into two hearts, and then one of those was made redundant. If the octopus's central heart is damaged, the octopus dies.

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