Biological classification uses taxonomic ranks, including among others (in order from most inclusive to least inclusive): Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species, and Strain.
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Kingdoms are very general- within the animal kingdom we can have both a sperm whale and a house fly. Species however are very specific. A plant and an animal will NEVER be part of the same species as they are not classified under the same kingdom
