If your specific purpose statement were "to inform my audience about the differences among steel, aluminum, and carbon bicycle frames" you would probably organize your speech in order.

You would probably organize your speech in topical order.

Explanation:

"Topical order involves taking the topic of your speech and dividing it into several subtopics. The subtopics are related to the topic as they come from it."

Reference: Darrin. “Ordering Main Points in Writing and Speaking.” Educational Research Techniques, 8 Aug. 2017

b) the planets year length would be longer

hope this !