Who first started the classification of Animal Kingdom on a scientific basis in ancient times?

Correct answer: Aristotle

Answer: A, Aristotle. Aristotle, an ancient Greek philosopher and naturalist, made one of the earliest systematic attempts to classify animals. He observed important visible features and divided animals broadly into those with red blood and those without obvious red blood. This was an early step toward zoological classification because organisms were grouped using biological characteristics rather than only names or uses. A is correct because Aristotle is traditionally regarded as the father of zoology and is credited with beginning the scientific study and classification of animals. B, Carolus Linnaeus, greatly developed modern taxonomy and binomial nomenclature much later, so he was not the ancient founder asked for here. C, Theophrastus, is mainly associated with the early scientific study and classification of plants, not the first classification of the Animal Kingdom. D, Pliny compiled a large natural-history work, but he did not make the foundational systematic contribution attributed to Aristotle. Memory cue: Aristotle is linked with ancient animal classification; Linnaeus is linked with modern naming.