classification - A system of organizing living things into groups., domain - A group of living things that is bigger than kingdom., Archaea - Single-celled organisms without a nucleus, different from bacteria, taxonomy - A branch of science that studies classification, bacteria - Very small single-celled organisms, some of which can cause disease, eukarya - Living things with cells that have a nucleus (animals, plants, fungi, protists)., organism - A living thing (animal, plant, bacterium, etc.).,

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