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609: "The Wonders of the Circulatory System"

Interesting Things with JC #609: "The Wonders of the Circulatory System" - Did you know that a child's circulatory system could stretch over 60,000 miles? As adults, our bodies house around 100,000 miles of blood vessels!

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609: "The Wonders of the Circulatory System" JC - Royalty Free

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