We all know what is alive (animals plants bacteria etc etc) and what is not (rocks water etc) but could anybody give a nice and precise explanation of what it takes to be alive (what are the minimum requirements to be considered alive)???
I am asking this because I see many people consider life (being alive) to be a really complicated thing to happen, and I am wondering that if we can't exactly explain what life IS, how can we understand how complicated it is to happen by chance or by accident.
PS: this is not a question of metaphysics (what is life's meaning etc etc) its a simple question with a hard answer. A definition of life (or being alive) if you want...