  Exact law of mortality dynamics in changing populations and environment is
derived. The law is universal for all species, from single cell yeast to
humans. It includes no characteristics of animal- environment interactions
(metabolism etc) which are a must for life. Such law is unique for live systems
with their homeostatic self-adjustment to environment. Its universal dynamics
for all animals, with their drastically different biology, evolutionary
history, and complexity, is also unique for live systems-cf different
thermodynamics of e.g. liquids and glasses. The law which is valid for all
live, and only live, systems is a life specific law of nature. Mortality is an
instrument of natural selection and biological diversity. Its law which is
preserved in evolution of all species is a conservation law of mortality,
selection, evolution, biology. The law implies new kind of mortality and
adaptation which dominate in evolutionary unprecedented protected populations
and, in contrast to species specific natural selection, proceed via universal
stepwise rungs. The law demonstrates that intrinsic mortality and at least
certain aspects of aging are disposable evolutionary byproducts, and directed
genetic and/or biological changes may yield healthy and vital Methuselah
lifespan. This is consistent with experiments. Universality implies that single
cell yeast may provide a master key to the cellular mechanism of universal
mortality, aging, selection, evolution, and its regulation in all animals. One
may look for its manifestations in animal cells also, e.g., in their
replicative senescence.
