How many hearts does an octopus have?

A medium science trivia prompt from the quest1on archive. Try it first, then compare your answer with the explanation and related questions below.

Explanation

Octopuses have three hearts. Two pump blood through the gills, and one pumps it through the rest of the body. Their blood is blue because it contains copper-based hemocyanin.

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Octopuses have three hearts. Two pump blood through the gills, and one pumps it through the rest of the body. Their blood is blue because it contains copper-based hemocyanin.

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