Biology · Taxonomic Keys

In a biological key, a 'couplet' represents the choice made between two contrasting options, which results in:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Acceptance or rejection based on external criteria
2Acceptance of only one option and rejection of the other✓
3Acceptance of both options
4Rejection of both options

Correct answer

Acceptance of only one option and rejection of the other

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In a biological key, a 'couplet' represents the choice made between two contrasting options, which results in:

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In a biological key, a 'couplet' represents the choice made between two contrasting options, which results in:

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