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Intro • Earth has millions of organisms. • Absolute biological chaos. • Scientists were like: “Alright we need to organize this mess.” Aristotle • First guy who tried classifying organisms. • Plants → trees, shrubs, herbs • Animals → with red blood / without red blood • Good try… but scientifically kinda weak. ⸻ Linnaeus • In 1758, Linnaeus created the Two-Kingdom system: • Plantae • Animalia • Basically everything was dumped into two boxes. ⸻ Why it failed Problems with this system: • Bacteria