A text feature, if used, would best help the reader understand the importance of lowering the cover slip slowly would be Bold Font.
The text feature bold font allows a reader to easily access information as noticing the bold fonts. Text features are present in both fiction and non-fiction text. The few text features are :- index, glossary, headings/sub headings, bold words, pictures, captions, diagrams which are labelled, etc.
It is so because it helps the readers to visualize the important features, texts, themes to understand. Basically, text features have different uses/purposes which an author chooses for the readers which will help them to understand the information, which author wants to tell them.
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