Bastiat: Each of us has a natural right to ... These are the three basic requirements of life
So, "rights" are freedoms to those actions that a human must take to preserve his basic requirements of life.
Bastiat then gives some examples of rights, but I don't see where he explains the necessary and sufficient qualities or explains how those qualities lead to rights.
I suppose inherent in 'freedom to act' are (1) the ability to act (on one's surroundings) and (2) volitional capacity. Inherent in 'preserving his life' are (3) mortality and (4) being alive.
So are these 4 items the necessary and sufficient qualities? The only one that might be contrued as uniquely human is (2).
Then, I still don't see how rights are relevent or could have emerged in a one-person situation, or in a situation where people cannot communicate with one another but just run around bumping into each other.
Even if the definition of "rights" and the qualities required for them are presented, I still haven't seen it explained how those qualities lead to rights.
Seems like we're making progress though.