that probability is as follows : form : probability unicellular organisms or less ( naked genetic in formation ) : .7840 multicellular organisms , simple : .1940 multicellular organisms , complex but lacking coordinated central nervous system : .0140 multicellular organisms with integrated organ systems including nervous system : .0018 multicellular organisms with complex nervous system capable of handling 7+ data ( human capability ) : .0002 total : 1.0000 *** these considerations lead me to believe that the first human interaction with extraterrestrial life will consist of contact with organisms similar to , if not identical to , earth bacteria or viruses .