this post was submitted on 12 Nov 2025
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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