Final answer:
After reading an article, Maggie should list the facts from it to assist in properly paraphrasing the content for her research paper on arachnids and crustaceans.
Step-by-step explanation:
Right after Maggie reads an article for her research paper on comparing and contrasting arachnids and crustaceans, and before she plans to paraphrase her source materials, the best course of action is to list the facts she learned from the article. Detailing the information she gathers will help her understand and accurately present the content in her own words. It is also critical that she keep accurate notes for proper citation to avoid plagiarism and to maintain her credibility with her readers.