Question

PowerPoint's varied themes and ____ help give presentations a unified and aesthetically pleasing look. layouts panes tabs slides

Answer 1

The answer is layout.
In customizing slide elements, varied themes and layouts give the presentations in PowerPoint a unified and aesthetically pleasing look. To give your slides unique quality, you can modify the default theme and layout settings. One of the easier methods in creating a  custom presentation is to change a theme for one or more slides.