Sublime

The fascia of the abdomen also connects the vertebrae, the psoas muscles, and the kidneys to the diaphragm at the muscular insertions. In fact, basically all organs both above and below the diaphragm area are connected to the diaphragm in some way, and thus the act of respiration moves them all.

Warm-blooded animals—technically called endotherms—have broken free of this handicap. They produce their own heat—often by packing more energy-producing mitochondria into their cells—and

Whatever they were, they weren’t unique to us. Later anatomists identified this same three-bone set in other mammals—but only mammals.