If you wish to maintain a consistent style to all the documents you create, it would be to use a

Apply a consistent look across the whole document instead of having to format each section individually.Automatically number section headers.Apply same font to the entire text body.Apply the same font to header sections.Use a consistent paragraph spacing.Pick a default color scheme for SmartArt, charts, and shapes.Pick from a number of pre-designed styles use them as your own and modify them.

I believe that the best answer to the question: If you wish to maintain a consistent style to all the documents you create, it would be helpful to use a:__, would be: a template.

Explanation:

The reason for this being the best answer is that templates are like standardized guidelines, or frameworks that literally allow anyone to continue the work of another, or their own, even if the information may be different. Templates are preset, pre-established frameworks, and they will ensure that throughout your work you stay consistent in style and form. It will also allow someone else to evidence that style and follow it, if they have to continue something you were doing.

Canals and inland waterways, natural or artificial waterways used for The lay of the land (topography) and particularly changes in water levels inland waterway transport is still more economical than any other kind of transport.

Explanation: