Question

What does a couplet refer to?

Answer 1

Couplet:

1. A couplet is a pair of opposing characters used as an identification key to assisting in the identification of a newly discovered organism.
2. A couplet denotes a choice between two opposing choices, with one being accepted and the other being rejected.
3. Each couplet provides characteristics that become more specific.
4. Thus, couplets make the identification easy.