Joe Harker
1st in the Premiership!
Think back to our earliest ancestor, a very simple bacteria, at the point when it begin to live it must have been able to feed itself, and reproduce itself(otherwise we wouldn't be here). Therefore every animal, plant, bacteria and fungi to name a few, must have this programmed into them someway. Sure other instincts may have come in to the programme as well but this was the core programme in a way.