Nano bots are the simplest form of life that can be simulated in Darwinbots.
They are conditionless and have only one store command. They use arithmetic operations to return each cycle the sysvar that must be stored into.
start 50 830 5 1 rnd mult sub 500 1 rnd mult sub 30 1 rnd mult sub 299 1 rnd mult sub store stop
This minimal bot is able to tiefeed, reproduce, move and adjust its eye width. It's lifespan is limited though to its starting body points.
A different development line for nano bots may be nullifying all sysvars but one for each cycle, using Single Gene code.