Why is it important for a speaker to include supporting material in a presentation?

Identify what is wrong with each italicized pronoun reference. carolyn sang higher than the other sopranos but she didn't support it properly. placed too far from antecedent no specific antecedent ambiguous reference

Statistics show that internet usage in the united states has grown from just 41% of households in 2000 to 77% of households in 2010. which of the following best describes how online shopping has added to cultural diffusion in the united states? it encourages people to purchase more than they normally would. it makes news and information about products available in an easy-to-consume format. it has allowed large corporations to expand into new states, creating more jobs. it makes goods more accessible to people who might not normally be able to get them.

Why isn’t the mood saddened by this tragic event