Fish and Evolution: How Did Fish Develop Lungs from Gills to Breathing on Land?
Fish first used gills to breathe. During evolution, some fish developed lungs from tissue around their gills. These lungs helped them breathe in low-oxygen areas. Later, swim bladders evolved from lung tissue, allowing fish to float while still supporting their respiratory needs. One group of fish known as the lobe-finned fish played a pivotal role … Read more