Sea Spiders Digestive Tracts Help Deliver Oxygen

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Sea spiders have extremely long legs, and their legs contain stretches of their digestive tract. It has been discovered that when their digestive system contracts, it causes the blood to move which delivers oxygen throughout a sea spider’s body. Jon Harrison, an evolutionary Physiologist at Arizona State University in Tempe, explains, “Essentially they use their legs like gills. To my knowledge, no one had thought of this before — certainly no one has demonstrated this before.”
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