Whether it’s a tiny snail or a massive whale, most living organisms rely on blood flowing through their bodies to stay alive—but it may not look like what many of us picture
, which has no blood pigment at all thanks to a genetic mutation that removed hemoglobin from their bodies. In the fish’s frigid southern habitat, oxygen is plentiful, and the gas seeps in directly through the fish’s gills and skin.
don’t have blood, instead possessing a comparable fluid called hemolymph, which transports hormones and gases through their system, except for oxygen—they absorb that directly through openings along their sides or back., an entomologist at the University of Nebraska-Lincoln. Hemolymph can have yellowish or bluish-green pigments that come from the insects’ plant diets.
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