Death is the p ermanent, irreversible cessation of all biological functions that sustain a living organism.[1] Brain death is sometimes used as a legal definition of death.[2] The remains of a previously living organism normally begin to decompose shortly after death.[3] Death is an inevitable, universal process that eventually occurs in all living organisms.
As of the early 21st century, over 150,000 humans die each day.[4][5]
5Life extension
6Location
7Emotional response
8Society and culture
9Consciousness
10In biology
10.1Natural selection