Did Lungs Evolved from Swim Bladders?
It Has Long Been Believed That the Lungs of Land Vertebrates Like Us Humans Evolved from "Swim Bladders" -- Gas-Filled Sacs in Bony Fish That Help Them Adjust...
It has long been believed that the lungs of land vertebrates like us humans evolved from "swim bladders" -- gas-filled sacs in bony fish that help them adjust their depth. ... Polypterus have lungs, not a swim bladder, and the team found that these lungs grow and develop in much the same way as those of land vertebrates.
Where did lungs evolve from?
Darwin believed that lungs evolved from gas bladders, but the fact that fish with lungs are the oldest type of bony fish, plus molecular and developmental evidence, points to the reverse – that lungs evolved before swim bladders.
When did lungs evolve?
However, they also had lungs that they used to breathe oxygen. Between 390 and 360 million years ago, the descendents of these organisms began to live in shallower waters, and eventually moved to land. As they did, they experienced natural selection that shaped many adaptations for a terrestrial way of life.
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
