people with kinds that positively enough their vacuum have a greater inability to survive / reproduce
human_beings has different_lifespans mortal_species_survives_must has method_for_reproduction humans has competitive_nature hybrid_vigor is tendency. hallmark_of_different_species is inability_to_mate_and_reproduce. all_human_populations has inbuilt_resistance_to_prion_diseases mankind_probably has finite_existence all_living_creatures has limited_lifespan humans is not_perfect_beings. machines has no_mechanism_to_reproduce_themselves