Porque esta vivo un ser vivo?

Explanation:

The translation of the question is:

Answering from a scientific point of view, not a philoshophical one, a living organism is differentiated from a non-living entity in that the living being is born, grows, has the ability to reproduce and dies.

All that is possible because the living beings posses a complex network of systems that sustain their life.

Those systems include the homeosthasis, the metabolism, the answer to external stimulus, the ability of adaptation, the development (growing) and the reproduction.

To be considered a living being the organism must count wiht all those systems.

It is important that you know that viruses are not living organisms: they are chemical molecules which do not have metabolism and do not grow.

it would be a gas formation