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CGP EDU Academic Team
Published on: August 13, 2026
Who divided the animals into 2 groups, those which had red blood and those that did not?
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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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