The Evolution of Lungs

There are going to be things that this human will experience after being born for which it has no framework or categories whatsoever, given its experience so far. For example, this is interesting. Look up at the picture and take a deep breath with me. So you just use your lungs. When did your lungs start developing? Just think about that question. What were your lungs doing in the womb? Were they inhaling and exhaling? And what were they pumping in and out? Liquid. You used to live in liquid. How is that strange? If you were to try and live in liquid now, it will kill you. But not, there's something happened at the moment of birth,