you know how all mammals were once fish? Well some of those intermediary species still survive to this day, like the lovable platypus :3 Also marsupials aka pouch things—one of those intermediary steps from layings like fish to incubating them in a placenta.
We still filter out all our salt, then mix it back into our blood, a slight modification of a marine fish’s method for dumping excess salt. Being terrestrial we can’t afford to lose salt
you know how all mammals were once fish? Well some of those intermediary species still survive to this day, like the lovable platypus :3 Also marsupials aka pouch things—one of those intermediary steps from layings like fish to incubating them in a placenta.
We still filter out all our salt, then mix it back into our blood, a slight modification of a marine fish’s method for dumping excess salt. Being terrestrial we can’t afford to lose salt