Based on the principle of speech delivery, the demographic factor to consider is Age
<h3>Age</h3>
- Since individuals of the same generation often share similar values, beliefs, and attitudes, age is an important variable to consider.
<h3>Age is an Important Audience Characteristic</h3>
- Age is an important variable to consider when analyzing your target audience. Individuals who grow up at the same time are called cultural generations. They often share many of the same experiences as others of the same age group.
In conclusion, we can conclude that the correct answer is Age.
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It would be the textbook glossary. A dictionary would be equally useful, but in a science class the teacher would want students to rely on the textbook glossary.
I think "that" is the adjective clause because you can remove it without ruining the sentence.