Life

Life like a Train. People can't control their life. Because , life is controlling us. The definition of life, the determination of the fundamental nature of living things, and the explanation of life's origin and evolution , have engendered much thought, debate and research throughout history. The perspective on life at any given moment in history, even today, qualifies as realistic and fruitful only to the extent of human knowledge at the time. In this article we focus defining the activity of living.
We focus on what essential activities living entities perform that enable their living — specifically, we focus on the fundamental processes of living, those that constitute the System that counts as a living thing, the "common denominator that allows for the discrimination of the living from the non-living", as inferred from the study of Earth's living things in the light of science. This article takes, as its theme, “Life is what is common to all living things on Earth” (Christian De Duve).
Those include the basic working unit of life, the biological cell, and the many molecular structures and processes cells have in common, including a boundary; the importation of energy and exportation of entropy;metabolism;information processing and communication; self-organization and self-defense; adaptation; death; (re)production from parents; and, cognition of self and the outside world.