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When citing testimony in a speech, the speaker should always:

How many ideas should each main point introduce?

All of these are part of vocal variety EXCEPT:

If the audience is aware of counterclaims to the argument and the speaker does not acknowledge them, the speaker can lose credibility.

Modern wars tend to be fought

The percentage of people who have access to and use the Internet in a given location is known as the

Biomass energy comes from

The ozone layer of the Earth’s atmosphere

The link between global warming and climate change has been recognized

Renewable resources include