Final answer:
During the prewriting stage, a writer should do research to gather evidence.
Step-by-step explanation:
During the prewriting stage of the writing process, a writer should do research to gather evidence. This is the stage where writers brainstorm ideas, create outlines or mind maps, and conduct research to collect information and evidence to support their writing. Researching at this stage helps writers gather relevant information and organize their thoughts before moving on to the drafting stage.
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