Who gave the earliest scientific system of classification of living organisms?

Correct answer: Aristotle

Correct answer: B, Aristotle. Aristotle is credited with one of the earliest systematic attempts to classify living organisms using observable characteristics. In his treatment of plants, he used broad forms such as trees, shrubs, and herbs; in animals, he also considered features such as the presence or absence of red blood. A is incorrect because Linnaeus worked much later and is famous for binomial nomenclature and an influential artificial system. C is incorrect because Whittaker proposed the five-kingdom system in the twentieth century. D is incorrect because Darwin explained evolution by natural selection; he did not give the earliest classification system named in this question. “Scientific” here means that the classification followed observed features in an organized manner; it does not mean that Aristotle’s system was fully modern or evolutionary. Memory cue: Aristotle is linked with the earliest organized classification, Linnaeus with two-word names, and Whittaker with five kingdoms.