prokaryote
Normally unicellular organisms possessing cells without a membrane-bound nucleus.
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Ichthyological terms, not general ones.
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prokaryotic
Possessing cells without membrane-bound nuclei. Typical in bacteria and cyanobacteria.
bacteria
Large group of prokaryotic microorganisms representing one of the three domains of living organisms. Present in the majority of Earth's habitats as well as organic matter and the bodies of live animals. Most are harmless, some beneficial and others pathogenic.
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organism
An individual life form that can react to stimuli, reproduce, grow, and maintain homeostasis. There are five main groups, or kingdoms: prokaryotes, protists, fungi, plants, and animals.
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