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Octopus has three hearts due to its XL body , branchial  hearts plump blood through each of 2 gills , while the 3rd is a systemic heart that pumps through the body.
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Octopuses have three hearts. Two branchial hearts pump blood through each of the two gills, while the third is a systemic heart that pumps blood through the body. Octopus blood contains the copper-rich protein hemocyanin for transporting oxygen......................