ARE humans “natural?” The answer is, as so often, “yes” and “no.”

Notwithstanding the 38 per cent of adults in the US who still believe that humans were created 4,000 years ago — and Eve merely a spare rib — most people accept that humans have evolved over time from pre-human primates who in turn evolved from more primitive vertebrates who came, probably, from something allied to sea squirts and so on back to when and wherever life first began.  
Since earliest times humans have been aware of their biological nature – that we are conceived, live and die as do all other species.  

And since Darwin, at least, we have been aware also that we are — or were once — part of the natural world, in relation both to our evolutionary origins and to the conditions of our survival today.