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  • Researchers have found that sea spiders circulate oxygen through their bodies not with their hearts, but with their guts instead
    Biology
    Weak-hearted sea spiders pump blood with their guts
    Sea spiders already look decidedly alien, like they’re about to latch onto your face, but now scientists have found they’re equally bizarre on the inside. With weak hearts, the crafty creatures instead use a sprawling system of guts to pump blood and oxygen throughout their bodies.