The best replacement for organisms is unicellular organisms.

The best alternatives to organisms are rated as following:
★★★★★  unicellular organisms
★★★★  gmo
★★★★  nonliving organisms
★★★★  species
★★★★  multicellular organisms
★★★  multicellular
★★★  eukaryotic organisms
★★  non living organisms
★  unicellular
★  crops
★  terrestrial
★  gmos
★  gram negative organisms
★  single celled organisms
★  freshwater organisms
★  colonial organisms
★  non living
  genetically modified organisms

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Speaking about organisms, one probably shouldn't forget about organisms.

Other search terms related to organisms and their ratings are:
★★★★★ organisms
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organisms
unicellular organisms
gmo