How many hearts does an octopus have?
Three
The answer was Three. Here's the why, the decoys, and the source trail.
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An octopus has three hearts. Two pump blood to the gills, while the third circulates oxygenated blood through the rest of the body.
This answer is checked against NOAA Ocean Service: Undersea Creatures and NOAA: Love Is in the Air and Sea.
A good question makes the wrong answers feel close. Here is the clean read on the set.
- One - a decoy; it may live near the same topic, but it does not answer this exact clue.
- Two - a decoy; it may live near the same topic, but it does not answer this exact clue.
- Three - correct answer.
- Four - a decoy; it may live near the same topic, but it does not answer this exact clue.
Three is the one to remember. An octopus has three hearts. Octopus blood uses a copper-rich protein called hemocyanin to carry oxygen, which gives the blood a blue color.
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Sources: NOAA Ocean Service, NOAA