Final answer:
You can indeed reuse slides from previous presentations in addition to inserting new ones or duplicating existing slides, so the statement is false.
Step-by-step explanation:
The statement that you cannot re-use slides from previous presentations is false. In presentation software such as Microsoft PowerPoint or Slides, you have the ability to insert a new slide, duplicate an existing slide, and also reuse slides from other presentations. You can typically import slides from a previous presentation into your current one, either by copying and pasting them directly, or using a feature designed to insert slides from other presentations.