On the basis of science and logic. Chemistry: All matter in this universe is composed of 100+ elements. They are NON-LIVING things. Physics: Space is also a NON-LIVING thing. Humans: Say a human weighs 60kg. Whatever a man is composed of, all of his body is made up of matter,thus from these 100+ elements which are all NON-LIVING things, so the man is essentially a NON-LIVING thing. Q) Can combination of two non-living things make a living thing ? No. If someone says yes, that means living thing is made up of non-living things? So fundamentally there is nothing which is living thing! Q) Can we call the different changes, movement of the non-living things as living thing? (What we call eating, metabolic, neural activity, growing, reproduction etc is a change and movement of mass and energy from, one place and form to another form and place.) So the answer maybe NO. But science defines a living being in similar fashion. So what are we Humans?? LIVING BEINGS OR NON-LIVING THINGS ?? PS: Religious definitions and explanations can be kept aside for a while. Lets discuss it on the basis of Science n logic.