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And who made you the arbiter on what is and is not property?

I just go with what is considered the definition of property for centuries or longer and which seems to me too is correct.

If it is not my body, then to whom does it belong,

It belongs to you, but is not your property, as it is not the property of anyone else.

The air molecule in your lung also belongs to you for the moment, still it is not your property - and here we are talking about somethign that you could sell, we just all agreed to not do that, not own that, as indians agreed to not own rivers.