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Aristotle's classification, Aristotle was the earliest to attempt a more scientific basis for classification, of organisms., • He classified plants to trees, shrubs & herbs and animals into 2 groups, those, with red blood and without red blood., Mammals,, lizards, birds,, fish, Red Blood, ANIMALS, Hard bodied, insects, No Red, Blood, Shell, Shellfish, Soft bodied, No shell, Jellyfish, bankofbiology.com

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Two-Kingdom classification, Drawbacks of 2-kingdom classification, Prokaryotes (Bacteria, cyanobacteria) & eukaryotes, (fungi, mosses, ferns, gymnosperms & angiosperms), were included under 'Plants' based on the presence of, cell wall. But they are widely differed in other features., It included unicellular & multicellular organisms in, same group. E.g. Chlamydomonas & Spirogyra were, placed under algae., Chlamydomonas, Spirogyra, • It did not differentiate between heterotrophic fungi, and autotrophic green plants. Fungi have chitinous cell, wall while the green plants have cellulosic cell wall., bankofbiology.com