<Ul> <Li> input transducer, internal transducer, channel and net, timer (added later), decoder, associator, memory, decider, encoder, output transducer . </Li> </Ul> <Li> input transducer, internal transducer, channel and net, timer (added later), decoder, associator, memory, decider, encoder, output transducer . </Li> <P> James Grier Miller in 1978 wrote a 1,102 - page volume to present his living systems theory . He constructed a general theory of living systems by focusing on concrete systems--nonrandom accumulations of matter--energy in physical space--time organized into interacting, interrelated subsystems or components . Slightly revising the original model a dozen years later, he distinguished eight "nested" hierarchical levels in such complex structures . Each level is "nested" in the sense that each higher level contains the next lower level in a nested fashion . </P> <P> His central thesis is that the systems in existence at all eight levels are open systems composed of twenty critical subsystems that process inputs, throughputs, and outputs of various forms of matter--energy and information . Two of these subsystems--reproducer and boundary--process both matter--energy and information . Eight of them process only matter--energy . The other ten process information only . </P>

What is the smallest living system of an organism