Answer:
Fashion forecasting involves predicting future trends by observing changes in the current situation and learning from the past trends.
Explanation:
The above sentence uses parallel structure.
Parallel structure (also known as parallelism) refers to the use of same pattern of words or phrases in order to show the equal importance of the words or ideas. When words and phrases are used, they should not only match in structure, but also in tense. Parallel structure is seen when conjunctions like and, but, or, etc are used.
In the sentence, we see that observing and learning follow the same pattern just before and after the and. This makes the sentence a parallel structure.
The use of parallel structure is used to add clarity to writing and to help make the sentence easier to understand.