Final answer:
A cinquain poem differs from a diamante poem in the number of lines and the approach to subject matter.
Step-by-step explanation:
An example of a compare-and-contrast text structure is the statement: A cinquain poem differs from a diamante poem in the number of lines and the approach to subject matter. This statement compares and contrasts two different types of poems, highlighting their differences in terms of structure and subject matter. The author uses the words 'differs' to indicate the comparison and 'in the number of lines and the approach to subject matter' to specify the contrasting elements.