an octopus has how many hearts ?
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An octopus has three hearts, nine brains, and blue blood.
300 species
There are around 300 species of octopus and they are found in every ocean.
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three hearts
An octopus has three hearts, nine brains, and blue blood. Two hearts pump blood to the gills, while a third circulates it to the rest of the body. The nervous system includes a central brain and a large ganglion at the base of each arm which controls movements
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