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Structures that serve some of the functions of the circulatory

system in animals that lack the system. Image from Purves et al.,

Life: The Science of Biology, 4th Edition, by Sinauer Associates

(www.sinauer.com) and WH Freeman (www.whfreeman.com), used

with permission.

http://www.sinauer.com/http://www.whfreeman.com/http://www.whfreeman.com/http://www.sinauer.com/

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Circulatory systems of an insect (top) and mollusc (bottom). Images from Purves

et al., Life: The Science of Biology, 4th Edition,