The ancient ancestors of the human-sized coelacanth (see-leh-kanth) breathed with lungs, according to a new study. The modern coelacanth, like most fish, uses gills to get oxygen from the water, but its dinosaur-age ancestors also had a well-developed lung, allowing them to survive in low-oxygen shallow waters. It’s probable that during the Mesozoic Era, part of the coelacanth family moved to deeper waters, eventually losing their lung and relying solely on their gills to breathe.
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