Respuesta :

yusufabdulwahab950

Explanation:

it is important for a speaker to include supporting materials because he or she can made a mistake in other material in his or her hand or on the table

aribeccawil
The answer is:

Supporting materials serve a variety of functions in oral presentations: to clarify the speaker’s point, to emphasize the point, to make the point more interesting, and to furnish a basis that enables others to believe the speaker’s point.

Without supporting materials, an oral presentation is little more than a string of assertions (claims without backing).

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