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Arteries are thicker than veins. Veins are thin and have valves so the blood doesn't flow backwards when it returns to the heart. ​
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Arteries are thicker than veins. Veins are thin and have valves so the blood doesn't flow backwards when it returns to the heart. ​

User Bewusstsein
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Answer:good to know

Step-by-step explanation:

User Purvik Dhorajiya
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