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  • Rights: Sara L Roggemann, Three Flowers Photography Published 12 June 2012, Updated 23 March 2017 Size: 25 KB Referencing Hub media

    Most earthworm species have five aortic arches or ‘hearts’ that move blood around the body. The number of aortic arches varies amongst species.

    Acknowledgement: Sara L Roggemann, Three Flowers Photography

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