What are the main differences between living and non-living?

The concept of life is difficult enough even for modern science. Therefore, it is impossible to choose a specific feature, according to the possession of which, to call bodies alive.
First, living beings exchange matter and energy with the environment. A living being cannot be a closed system – it breathes, feeds, gets rid of waste.
Secondly, living beings are capable of self-reproduction. This is reproduction – offspring should be similar to the ancestors – heredity, and at the same time be different – variability.
And thirdly, living things can react to changes in the environment and adapt to them.