Final answer:
A characteristic of a heroic couplet is that it expresses a complete poetic thought.
Step-by-step explanation:
A characteristic of a heroic couplet is that it expresses a complete poetic thought. Heroic couplets are two line stanzas with end words that rhyme. They are written in iambic pentameter, which means each line has five metric feet. Alexander Pope, a poet from the 17th-18th century, frequently used heroic couplets in his works like "An Essay on Criticism".