Aristotle classified organism on the basis of_____?

Aristotle classified organisms based on observable characteristics like habitat, morphological features (size, physical form), and mode of locomotion. For animals, he used a system that included habitat (terrestrial, aquatic, aerial), movement (walking, swimming, flying), and the presence or absence of red blood. For plants, his classification was based on morphological features such as stem type, dividing them into herbs, shrubs, and trees.