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Rights: University of Waikato Published 14 August 2017 Size: 49 KB

Sea stars don’t use gills or lungs to breathe. They rely on diffusion across surfaces in their body. For example, most oxygen is taken up from water that passes over their tube feet and papulae or skin gills. Skin gills are small projections near the base of the spines, usually on the topside.

Acknowledgement: University of Waikato