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Biology Biological Classification Kingdom Classification Single Correct MCQ
Published on: August 13, 2026

Who divided the animals into 2 groups, those which had red blood and those that did not?

A
Whittaker
B
T.O. Diener
C
Aristotle
D
W.M. Stanley

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The correct answer is:
C

Aristotle, an ancient Greek philosopher, was the first to attempt a scientific basis for biological classification. He divided animals into two distinct groups based on the presence or absence of red blood:

• Enaima: Animals that possess red blood (mostly vertebrates).

• Anaima: Animals that do not possess red blood (mostly invertebrates)

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