This site gives 11 surprising facts about the circulatory system. http://www.livescience.com/39925-circulatory-system-facts-surprising.html
This site is a kid's blog about the circulatory system. http://www.imcpl.org/kids/blog/?p=12430
Amazing facts about the circulatory system are available on this site. http://warriors.warren.k12.il.us/dburke/amazingfactscirculatory.htm
More fun facts about the circulatory system are on this site. http://www.factmonster.com/dk/science/encyclopedia/circulatory-system.html
This site contains biology jokes. http://www.jupiterscientific.org/sciinfo/jokes/biologyjokes.html
This site is a kid's blog about the circulatory system. http://www.imcpl.org/kids/blog/?p=12430
Amazing facts about the circulatory system are available on this site. http://warriors.warren.k12.il.us/dburke/amazingfactscirculatory.htm
More fun facts about the circulatory system are on this site. http://www.factmonster.com/dk/science/encyclopedia/circulatory-system.html
This site contains biology jokes. http://www.jupiterscientific.org/sciinfo/jokes/biologyjokes.html
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