Epidemiologists and biomechanical engineers regularly dismiss the zombie apocalypse probability as a physical impossibility. A decomposing human corpse cannot walk, let alone chase potential victims down a street. Without functional blood circulation delivering oxygen and adenosine triphosphate (ATP) to muscle fibers, rigor mortis locks tissues in place within hours, followed quickly by autolysis as cellular enzymes rupture and consume tissues from the inside out.
Ambient environmental conditions would rapidly neutralize any reanimated corpse. High temperatures accelerate putrefaction and attract insect larvae that consume muscle tissue within days. Freezing climates solidify cellular fluids, turning brittle connective tissue into immobile crystal structures. Furthermore, terrestrial scavengers like vultures, feral dogs, and rodents would rapidly dismantle defenseless, rotting hosts. From an immunological and physical standpoint, a human corpse has zero mechanical capacity to sustain continuous locomotion, metabolic coordination, or aggressive behavior.
