How many hearts does an octopus have?
An octopus has three hearts: two pump blood through the gills and one pumps it to the rest of the body.
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- Do sea stars have blood?
“Sea stars have no blood and use seawater to move nutrients through their bodies.”
Reference: NOAA
More from this shelf
Are starfish fish?
Starfish aren't fish, so scientists prefer to call them sea stars.
What is an "otter tail"?
The Labrador Retriever has a thick, rounded, tapering "otter tail" that works like a rudder, helping the dog steer while it swims.