Starfish have no brain and no blood.
Why it is true
Instead of blood, they use filtered seawater to pump nutrients and oxygen through their bodies via a complex water vascular system.
Source: Biology
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.