Some invertebrates and all vertebrates have a circulatory system.
Question
Some invertebrates and all vertebrates have a circulatory system.
Solution
That's correct. Invertebrates like insects, spiders, and worms have an open circulatory system where the blood is not always contained within vessels. On the other hand, all vertebrates, including humans, have a closed circulatory system where the blood is always contained within vessels like arteries, veins, and capillaries.
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