Defining life extends beyond mere biological functions, encompassing intricate systems of organization, reproduction and response to stimuli. The question is that how it originated?
So life originated in a series of small steps:
1. Simple organic molecules were formed.
2. Replicating molecules evolved and began to undergo natural selection.
3. Replicating molecules became enclosed within a cell membrane.
4. Some cells began to evolve modern metabolic processes and out-competed those with older forms of metabolism.
All these forms the genetic basis of evolution of life.

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