In a taxonomic key, couplet means

contrasting characters in a pair.

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supplementary characters in a pair.

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complementary characters in a pair.

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none of these.

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Solution

The correct option is A
contrasting characters in a pair.

In a taxonomic key, couplet means a pair of statements serving as a clue.

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The keys are based on contrasting characters generally in a pair called ___.

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