It's good to start with definitions. The author says, "Human nature is best conceived of as a cluster of homeostatic properties, ie of traits that are dynamica

It's good to start with definitions. The author says, "Human nature is best conceived of as a cluster of homeostatic properties, ie of traits that are dynamically changing and yet sufficiently stable over evolutionary time to be statistically clearly recognisable." I'm not sure what the author is talking about. Our bodies are constantly out of stasis. Cells are constantly being repaired or replaced. Skin cells, muscle cells, cells of your internal organs. If you don't stay warm enough, you die. If you don't stay hydrated, you die. If you don't stress your muscles (ie, exercise) they atrophy. And all of these circumstances involve our internal bodies making transactions with the external world. Has the author controlled for these variables or are they just simply declaring that they don't exist?