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Biology The Living World History of Taxonomy Single Correct MCQ
Published on: August 11, 2026

The keys are based on contrasting characters generally in pairs called

A
Duplex
B
Couplet
C
Dimer
D
All of these

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The correct answer is:
B

In taxonomic keys, organisms are identified using pairs of contrasting statements called couplets. Each couplet leads to the next step until identification.

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